src/com/android/phone/PhoneInterfaceManager.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.phone;

import static com.android.internal.telephony.PhoneConstants.SUBSCRIPTION_KEY;

import android.Manifest.permission;
import android.app.AppOpsManager;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ComponentInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.NetworkStats;
import android.net.Uri;
import android.os.AsyncResult;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Messenger;
import android.os.PersistableBundle;
import android.os.RemoteException;
import android.os.ResultReceiver;
import android.os.ServiceManager;
import android.os.ShellCallback;
import android.os.SystemProperties;
import android.os.UserHandle;
import android.os.UserManager;
import android.os.WorkSource;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.service.carrier.CarrierIdentifier;
import android.telecom.PhoneAccount;
import android.telecom.PhoneAccountHandle;
import android.telecom.TelecomManager;
import android.telephony.CarrierConfigManager;
import android.telephony.CellInfo;
import android.telephony.CellInfoGsm;
import android.telephony.CellInfoWcdma;
import android.telephony.CellLocation;
import android.telephony.ClientRequestStats;
import android.telephony.IccOpenLogicalChannelResponse;
import android.telephony.LocationAccessPolicy;
import android.telephony.ModemActivityInfo;
import android.telephony.NeighboringCellInfo;
import android.telephony.NetworkScanRequest;
import android.telephony.RadioAccessFamily;
import android.telephony.Rlog;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.SmsManager;
import android.telephony.SubscriptionInfo;
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyHistogram;
import android.telephony.TelephonyManager;
import android.telephony.UiccSlotInfo;
import android.telephony.UssdResponse;
import android.telephony.VisualVoicemailSmsFilterSettings;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import android.telephony.ims.aidl.IImsCapabilityCallback;
import android.telephony.ims.aidl.IImsConfig;
import android.telephony.ims.aidl.IImsMmTelFeature;
import android.telephony.ims.aidl.IImsRcsFeature;
import android.telephony.ims.aidl.IImsRegistration;
import android.telephony.ims.aidl.IImsRegistrationCallback;
import android.telephony.ims.stub.ImsRegistrationImplBase;
import android.text.TextUtils;
import android.util.ArraySet;
import android.util.Log;
import android.util.Pair;
import android.util.Slog;

import com.android.ims.ImsException;
import com.android.ims.ImsManager;
import com.android.ims.internal.IImsServiceFeatureCallback;
import com.android.internal.telephony.CallManager;
import com.android.internal.telephony.CallStateException;
import com.android.internal.telephony.CarrierInfoManager;
import com.android.internal.telephony.CellNetworkScanResult;
import com.android.internal.telephony.CommandException;
import com.android.internal.telephony.DefaultPhoneNotifier;
import com.android.internal.telephony.ITelephony;
import com.android.internal.telephony.IccCard;
import com.android.internal.telephony.LocaleTracker;
import com.android.internal.telephony.MccTable;
import com.android.internal.telephony.NetworkScanRequestTracker;
import com.android.internal.telephony.OperatorInfo;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneConfigurationManager;
import com.android.internal.telephony.PhoneConstantConversions;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.PhoneFactory;
import com.android.internal.telephony.ProxyController;
import com.android.internal.telephony.RIL;
import com.android.internal.telephony.RILConstants;
import com.android.internal.telephony.ServiceStateTracker;
import com.android.internal.telephony.SmsApplication;
import com.android.internal.telephony.SmsApplication.SmsApplicationData;
import com.android.internal.telephony.SubscriptionController;
import com.android.internal.telephony.TelephonyPermissions;
import com.android.internal.telephony.euicc.EuiccConnector;
import com.android.internal.telephony.uicc.IccIoResult;
import com.android.internal.telephony.uicc.IccUtils;
import com.android.internal.telephony.uicc.SIMRecords;
import com.android.internal.telephony.uicc.UiccCard;
import com.android.internal.telephony.uicc.UiccCardApplication;
import com.android.internal.telephony.uicc.UiccController;
import com.android.internal.telephony.uicc.UiccProfile;
import com.android.internal.telephony.uicc.UiccSlot;
import com.android.internal.telephony.util.VoicemailNotificationSettingsUtil;
import com.android.internal.util.HexDump;
import com.android.phone.vvm.PhoneAccountHandleConverter;
import com.android.phone.vvm.RemoteVvmTaskManager;
import com.android.phone.vvm.VisualVoicemailSettingsUtil;
import com.android.phone.vvm.VisualVoicemailSmsFilterConfig;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import java.util.Map;

/**
 * Implementation of the ITelephony interface.
 */
public class PhoneInterfaceManager extends ITelephony.Stub {
    private static final String LOG_TAG = "PhoneInterfaceManager";
    private static final boolean DBG = (PhoneGlobals.DBG_LEVEL >= 2);
    private static final boolean DBG_LOC = false;
    private static final boolean DBG_MERGE = false;

    // Message codes used with mMainThreadHandler
    private static final int CMD_HANDLE_PIN_MMI = 1;
    private static final int CMD_TRANSMIT_APDU_LOGICAL_CHANNEL = 7;
    private static final int EVENT_TRANSMIT_APDU_LOGICAL_CHANNEL_DONE = 8;
    private static final int CMD_OPEN_CHANNEL = 9;
    private static final int EVENT_OPEN_CHANNEL_DONE = 10;
    private static final int CMD_CLOSE_CHANNEL = 11;
    private static final int EVENT_CLOSE_CHANNEL_DONE = 12;
    private static final int CMD_NV_READ_ITEM = 13;
    private static final int EVENT_NV_READ_ITEM_DONE = 14;
    private static final int CMD_NV_WRITE_ITEM = 15;
    private static final int EVENT_NV_WRITE_ITEM_DONE = 16;
    private static final int CMD_NV_WRITE_CDMA_PRL = 17;
    private static final int EVENT_NV_WRITE_CDMA_PRL_DONE = 18;
    private static final int CMD_NV_RESET_CONFIG = 19;
    private static final int EVENT_NV_RESET_CONFIG_DONE = 20;
    private static final int CMD_GET_PREFERRED_NETWORK_TYPE = 21;
    private static final int EVENT_GET_PREFERRED_NETWORK_TYPE_DONE = 22;
    private static final int CMD_SET_PREFERRED_NETWORK_TYPE = 23;
    private static final int EVENT_SET_PREFERRED_NETWORK_TYPE_DONE = 24;
    private static final int CMD_SEND_ENVELOPE = 25;
    private static final int EVENT_SEND_ENVELOPE_DONE = 26;
    private static final int CMD_INVOKE_OEM_RIL_REQUEST_RAW = 27;
    private static final int EVENT_INVOKE_OEM_RIL_REQUEST_RAW_DONE = 28;
    private static final int CMD_TRANSMIT_APDU_BASIC_CHANNEL = 29;
    private static final int EVENT_TRANSMIT_APDU_BASIC_CHANNEL_DONE = 30;
    private static final int CMD_EXCHANGE_SIM_IO = 31;
    private static final int EVENT_EXCHANGE_SIM_IO_DONE = 32;
    private static final int CMD_SET_VOICEMAIL_NUMBER = 33;
    private static final int EVENT_SET_VOICEMAIL_NUMBER_DONE = 34;
    private static final int CMD_SET_NETWORK_SELECTION_MODE_AUTOMATIC = 35;
    private static final int EVENT_SET_NETWORK_SELECTION_MODE_AUTOMATIC_DONE = 36;
    private static final int CMD_GET_MODEM_ACTIVITY_INFO = 37;
    private static final int EVENT_GET_MODEM_ACTIVITY_INFO_DONE = 38;
    private static final int CMD_PERFORM_NETWORK_SCAN = 39;
    private static final int EVENT_PERFORM_NETWORK_SCAN_DONE = 40;
    private static final int CMD_SET_NETWORK_SELECTION_MODE_MANUAL = 41;
    private static final int EVENT_SET_NETWORK_SELECTION_MODE_MANUAL_DONE = 42;
    private static final int CMD_SET_ALLOWED_CARRIERS = 43;
    private static final int EVENT_SET_ALLOWED_CARRIERS_DONE = 44;
    private static final int CMD_GET_ALLOWED_CARRIERS = 45;
    private static final int EVENT_GET_ALLOWED_CARRIERS_DONE = 46;
    private static final int CMD_HANDLE_USSD_REQUEST = 47;
    private static final int CMD_GET_FORBIDDEN_PLMNS = 48;
    private static final int EVENT_GET_FORBIDDEN_PLMNS_DONE = 49;
    private static final int CMD_SWITCH_SLOTS = 50;
    private static final int EVENT_SWITCH_SLOTS_DONE = 51;
    private static final int CMD_GET_NETWORK_SELECTION_MODE = 52;
    private static final int EVENT_GET_NETWORK_SELECTION_MODE_DONE = 53;
    private static final int CMD_GET_CDMA_ROAMING_MODE = 54;
    private static final int EVENT_GET_CDMA_ROAMING_MODE_DONE = 55;
    private static final int CMD_SET_CDMA_ROAMING_MODE = 56;
    private static final int EVENT_SET_CDMA_ROAMING_MODE_DONE = 57;
    private static final int CMD_SET_CDMA_SUBSCRIPTION_MODE = 58;
    private static final int EVENT_SET_CDMA_SUBSCRIPTION_MODE_DONE = 59;
    private static final int CMD_GET_ALL_CELL_INFO = 60;
    private static final int EVENT_GET_ALL_CELL_INFO_DONE = 61;
    private static final int CMD_GET_CELL_LOCATION = 62;
    private static final int EVENT_GET_CELL_LOCATION_DONE = 63;

    // Parameters of select command.
    private static final int SELECT_COMMAND = 0xA4;
    private static final int SELECT_P1 = 0x04;
    private static final int SELECT_P2 = 0;
    private static final int SELECT_P3 = 0x10;

    private static final String DEFAULT_NETWORK_MODE_PROPERTY_NAME = "ro.telephony.default_network";
    private static final String DEFAULT_DATA_ROAMING_PROPERTY_NAME = "ro.com.android.dataroaming";
    private static final String DEFAULT_MOBILE_DATA_PROPERTY_NAME = "ro.com.android.mobiledata";

    /** The singleton instance. */
    private static PhoneInterfaceManager sInstance;

    private PhoneGlobals mApp;
    private Phone mPhone;
    private CallManager mCM;
    private UserManager mUserManager;
    private AppOpsManager mAppOps;
    private MainThreadHandler mMainThreadHandler;
    private SubscriptionController mSubscriptionController;
    private SharedPreferences mTelephonySharedPreferences;
    private PhoneConfigurationManager mPhoneConfigurationManager;

    private static final String PREF_CARRIERS_ALPHATAG_PREFIX = "carrier_alphtag_";
    private static final String PREF_CARRIERS_NUMBER_PREFIX = "carrier_number_";
    private static final String PREF_CARRIERS_SUBSCRIBER_PREFIX = "carrier_subscriber_";

    // The AID of ISD-R.
    private static final String ISDR_AID = "A0000005591010FFFFFFFF8900000100";

    private NetworkScanRequestTracker mNetworkScanRequestTracker;

    private static final int TYPE_ALLOCATION_CODE_LENGTH = 8;
    private static final int MANUFACTURER_CODE_LENGTH = 8;

    /**
     * A request object to use for transmitting data to an ICC.
     */
    private static final class IccAPDUArgument {
        public int channel, cla, command, p1, p2, p3;
        public String data;

        public IccAPDUArgument(int channel, int cla, int command,
                int p1, int p2, int p3, String data) {
            this.channel = channel;
            this.cla = cla;
            this.command = command;
            this.p1 = p1;
            this.p2 = p2;
            this.p3 = p3;
            this.data = data;
        }
    }

    /**
     * A request object to use for transmitting data to an ICC.
     */
    private static final class ManualNetworkSelectionArgument {
        public OperatorInfo operatorInfo;
        public boolean persistSelection;

        public ManualNetworkSelectionArgument(OperatorInfo operatorInfo, boolean persistSelection) {
            this.operatorInfo = operatorInfo;
            this.persistSelection = persistSelection;
        }
    }

    /**
     * A request object for use with {@link MainThreadHandler}. Requesters should wait() on the
     * request after sending. The main thread will notify the request when it is complete.
     */
    private static final class MainThreadRequest {
        /** The argument to use for the request */
        public Object argument;
        /** The result of the request that is run on the main thread */
        public Object result;
        // The subscriber id that this request applies to. Defaults to
        // SubscriptionManager.INVALID_SUBSCRIPTION_ID
        public Integer subId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;

        public WorkSource workSource;

        public MainThreadRequest(Object argument) {
            this.argument = argument;
        }

        MainThreadRequest(Object argument, Integer subId, WorkSource workSource) {
            this.argument = argument;
            if (subId != null) {
                this.subId = subId;
            }
            this.workSource = workSource;
        }
    }

    private static final class IncomingThirdPartyCallArgs {
        public final ComponentName component;
        public final String callId;
        public final String callerDisplayName;

        public IncomingThirdPartyCallArgs(ComponentName component, String callId,
                String callerDisplayName) {
            this.component = component;
            this.callId = callId;
            this.callerDisplayName = callerDisplayName;
        }
    }

    /**
     * A handler that processes messages on the main thread in the phone process. Since many
     * of the Phone calls are not thread safe this is needed to shuttle the requests from the
     * inbound binder threads to the main thread in the phone process.  The Binder thread
     * may provide a {@link MainThreadRequest} object in the msg.obj field that they are waiting
     * on, which will be notified when the operation completes and will contain the result of the
     * request.
     *
     * <p>If a MainThreadRequest object is provided in the msg.obj field,
     * note that request.result must be set to something non-null for the calling thread to
     * unblock.
     */
    private final class MainThreadHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            MainThreadRequest request;
            Message onCompleted;
            AsyncResult ar;
            UiccCard uiccCard;
            IccAPDUArgument iccArgument;

            switch (msg.what) {
                case CMD_HANDLE_USSD_REQUEST: {
                    request = (MainThreadRequest) msg.obj;
                    final Phone phone = getPhoneFromRequest(request);
                    Pair<String, ResultReceiver> ussdObject = (Pair) request.argument;
                    String ussdRequest =  ussdObject.first;
                    ResultReceiver wrappedCallback = ussdObject.second;

                    if (!isUssdApiAllowed(request.subId)) {
                        // Carrier does not support use of this API, return failure.
                        Rlog.w(LOG_TAG, "handleUssdRequest: carrier does not support USSD apis.");
                        UssdResponse response = new UssdResponse(ussdRequest, null);
                        Bundle returnData = new Bundle();
                        returnData.putParcelable(TelephonyManager.USSD_RESPONSE, response);
                        wrappedCallback.send(TelephonyManager.USSD_RETURN_FAILURE, returnData);

                        request.result = true;
                        notifyRequester(request);
                        return;
                    }

                    try {
                        request.result = phone != null
                                ? phone.handleUssdRequest(ussdRequest, wrappedCallback) : false;
                    } catch (CallStateException cse) {
                        request.result = false;
                    }
                    // Wake up the requesting thread
                    notifyRequester(request);
                    break;
                }

                case CMD_HANDLE_PIN_MMI: {
                    request = (MainThreadRequest) msg.obj;
                    final Phone phone = getPhoneFromRequest(request);
                    request.result = phone != null ?
                            getPhoneFromRequest(request).handlePinMmi((String) request.argument)
                            : false;
                    // Wake up the requesting thread
                    notifyRequester(request);
                    break;
                }

                case CMD_TRANSMIT_APDU_LOGICAL_CHANNEL:
                    request = (MainThreadRequest) msg.obj;
                    iccArgument = (IccAPDUArgument) request.argument;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("iccTransmitApduLogicalChannel: No UICC");
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_TRANSMIT_APDU_LOGICAL_CHANNEL_DONE,
                            request);
                        uiccCard.iccTransmitApduLogicalChannel(
                            iccArgument.channel, iccArgument.cla, iccArgument.command,
                            iccArgument.p1, iccArgument.p2, iccArgument.p3, iccArgument.data,
                            onCompleted);
                    }
                    break;

                case EVENT_TRANSMIT_APDU_LOGICAL_CHANNEL_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        if (ar.result == null) {
                            loge("iccTransmitApduLogicalChannel: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("iccTransmitApduLogicalChannel: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("iccTransmitApduLogicalChannel: Unknown exception");
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_TRANSMIT_APDU_BASIC_CHANNEL:
                    request = (MainThreadRequest) msg.obj;
                    iccArgument = (IccAPDUArgument) request.argument;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("iccTransmitApduBasicChannel: No UICC");
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_TRANSMIT_APDU_BASIC_CHANNEL_DONE,
                            request);
                        uiccCard.iccTransmitApduBasicChannel(
                            iccArgument.cla, iccArgument.command, iccArgument.p1, iccArgument.p2,
                            iccArgument.p3, iccArgument.data, onCompleted);
                    }
                    break;

                case EVENT_TRANSMIT_APDU_BASIC_CHANNEL_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        if (ar.result == null) {
                            loge("iccTransmitApduBasicChannel: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("iccTransmitApduBasicChannel: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("iccTransmitApduBasicChannel: Unknown exception");
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_EXCHANGE_SIM_IO:
                    request = (MainThreadRequest) msg.obj;
                    iccArgument = (IccAPDUArgument) request.argument;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("iccExchangeSimIO: No UICC");
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_EXCHANGE_SIM_IO_DONE,
                                request);
                        uiccCard.iccExchangeSimIO(iccArgument.cla, /* fileID */
                                iccArgument.command, iccArgument.p1, iccArgument.p2, iccArgument.p3,
                                iccArgument.data, onCompleted);
                    }
                    break;

                case EVENT_EXCHANGE_SIM_IO_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        request.result = new IccIoResult(0x6f, 0, (byte[])null);
                    }
                    notifyRequester(request);
                    break;

                case CMD_SEND_ENVELOPE:
                    request = (MainThreadRequest) msg.obj;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("sendEnvelopeWithStatus: No UICC");
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_SEND_ENVELOPE_DONE, request);
                        uiccCard.sendEnvelopeWithStatus((String)request.argument, onCompleted);
                    }
                    break;

                case EVENT_SEND_ENVELOPE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        request.result = new IccIoResult(0x6F, 0, (byte[])null);
                        if (ar.result == null) {
                            loge("sendEnvelopeWithStatus: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("sendEnvelopeWithStatus: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("sendEnvelopeWithStatus: exception:" + ar.exception);
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_OPEN_CHANNEL:
                    request = (MainThreadRequest) msg.obj;
                    uiccCard = getUiccCardFromRequest(request);
                    Pair<String, Integer> openChannelArgs = (Pair<String, Integer>) request.argument;
                    if (uiccCard == null) {
                        loge("iccOpenLogicalChannel: No UICC");
                        request.result = new IccOpenLogicalChannelResponse(-1,
                            IccOpenLogicalChannelResponse.STATUS_MISSING_RESOURCE, null);
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_OPEN_CHANNEL_DONE, request);
                        uiccCard.iccOpenLogicalChannel(openChannelArgs.first,
                                openChannelArgs.second, onCompleted);
                    }
                    break;

                case EVENT_OPEN_CHANNEL_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    IccOpenLogicalChannelResponse openChannelResp;
                    if (ar.exception == null && ar.result != null) {
                        int[] result = (int[]) ar.result;
                        int channelId = result[0];
                        byte[] selectResponse = null;
                        if (result.length > 1) {
                            selectResponse = new byte[result.length - 1];
                            for (int i = 1; i < result.length; ++i) {
                                selectResponse[i - 1] = (byte) result[i];
                            }
                        }
                        openChannelResp = new IccOpenLogicalChannelResponse(channelId,
                            IccOpenLogicalChannelResponse.STATUS_NO_ERROR, selectResponse);
                    } else {
                        if (ar.result == null) {
                            loge("iccOpenLogicalChannel: Empty response");
                        }
                        if (ar.exception != null) {
                            loge("iccOpenLogicalChannel: Exception: " + ar.exception);
                        }

                        int errorCode = IccOpenLogicalChannelResponse.STATUS_UNKNOWN_ERROR;
                        if (ar.exception instanceof CommandException) {
                            CommandException.Error error =
                                ((CommandException) (ar.exception)).getCommandError();
                            if (error == CommandException.Error.MISSING_RESOURCE) {
                                errorCode = IccOpenLogicalChannelResponse.STATUS_MISSING_RESOURCE;
                            } else if (error == CommandException.Error.NO_SUCH_ELEMENT) {
                                errorCode = IccOpenLogicalChannelResponse.STATUS_NO_SUCH_ELEMENT;
                            }
                        }
                        openChannelResp = new IccOpenLogicalChannelResponse(
                            IccOpenLogicalChannelResponse.INVALID_CHANNEL, errorCode, null);
                    }
                    request.result = openChannelResp;
                    notifyRequester(request);
                    break;

                case CMD_CLOSE_CHANNEL:
                    request = (MainThreadRequest) msg.obj;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("iccCloseLogicalChannel: No UICC");
                        request.result = false;
                        notifyRequester(request);
                    } else {
                        onCompleted = obtainMessage(EVENT_CLOSE_CHANNEL_DONE, request);
                        uiccCard.iccCloseLogicalChannel((Integer) request.argument, onCompleted);
                    }
                    break;

                case EVENT_CLOSE_CHANNEL_DONE:
                    handleNullReturnEvent(msg, "iccCloseLogicalChannel");
                    break;

                case CMD_NV_READ_ITEM:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_NV_READ_ITEM_DONE, request);
                    mPhone.nvReadItem((Integer) request.argument, onCompleted, request.workSource);
                    break;

                case EVENT_NV_READ_ITEM_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;     // String
                    } else {
                        request.result = "";
                        if (ar.result == null) {
                            loge("nvReadItem: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("nvReadItem: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("nvReadItem: Unknown exception");
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_NV_WRITE_ITEM:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_NV_WRITE_ITEM_DONE, request);
                    Pair<Integer, String> idValue = (Pair<Integer, String>) request.argument;
                    mPhone.nvWriteItem(idValue.first, idValue.second, onCompleted,
                            request.workSource);
                    break;

                case EVENT_NV_WRITE_ITEM_DONE:
                    handleNullReturnEvent(msg, "nvWriteItem");
                    break;

                case CMD_NV_WRITE_CDMA_PRL:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_NV_WRITE_CDMA_PRL_DONE, request);
                    mPhone.nvWriteCdmaPrl((byte[]) request.argument, onCompleted);
                    break;

                case EVENT_NV_WRITE_CDMA_PRL_DONE:
                    handleNullReturnEvent(msg, "nvWriteCdmaPrl");
                    break;

                case CMD_NV_RESET_CONFIG:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_NV_RESET_CONFIG_DONE, request);
                    mPhone.nvResetConfig((Integer) request.argument, onCompleted);
                    break;

                case EVENT_NV_RESET_CONFIG_DONE:
                    handleNullReturnEvent(msg, "nvResetConfig");
                    break;

                case CMD_GET_PREFERRED_NETWORK_TYPE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_GET_PREFERRED_NETWORK_TYPE_DONE, request);
                    getPhoneFromRequest(request).getPreferredNetworkType(onCompleted);
                    break;

                case EVENT_GET_PREFERRED_NETWORK_TYPE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;     // Integer
                    } else {
                        request.result = null;
                        if (ar.result == null) {
                            loge("getPreferredNetworkType: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("getPreferredNetworkType: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("getPreferredNetworkType: Unknown exception");
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_SET_PREFERRED_NETWORK_TYPE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_PREFERRED_NETWORK_TYPE_DONE, request);
                    int networkType = (Integer) request.argument;
                    getPhoneFromRequest(request).setPreferredNetworkType(networkType, onCompleted);
                    break;

                case EVENT_SET_PREFERRED_NETWORK_TYPE_DONE:
                    handleNullReturnEvent(msg, "setPreferredNetworkType");
                    break;

                case CMD_INVOKE_OEM_RIL_REQUEST_RAW:
                    request = (MainThreadRequest)msg.obj;
                    onCompleted = obtainMessage(EVENT_INVOKE_OEM_RIL_REQUEST_RAW_DONE, request);
                    mPhone.invokeOemRilRequestRaw((byte[]) request.argument, onCompleted);
                    break;

                case EVENT_INVOKE_OEM_RIL_REQUEST_RAW_DONE:
                    ar = (AsyncResult)msg.obj;
                    request = (MainThreadRequest)ar.userObj;
                    request.result = ar;
                    notifyRequester(request);
                    break;

                case CMD_SET_VOICEMAIL_NUMBER:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_VOICEMAIL_NUMBER_DONE, request);
                    Pair<String, String> tagNum = (Pair<String, String>) request.argument;
                    getPhoneFromRequest(request).setVoiceMailNumber(tagNum.first, tagNum.second,
                            onCompleted);
                    break;

                case EVENT_SET_VOICEMAIL_NUMBER_DONE:
                    handleNullReturnEvent(msg, "setVoicemailNumber");
                    break;

                case CMD_SET_NETWORK_SELECTION_MODE_AUTOMATIC:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_NETWORK_SELECTION_MODE_AUTOMATIC_DONE,
                            request);
                    getPhoneFromRequest(request).setNetworkSelectionModeAutomatic(onCompleted);
                    break;

                case EVENT_SET_NETWORK_SELECTION_MODE_AUTOMATIC_DONE:
                    handleNullReturnEvent(msg, "setNetworkSelectionModeAutomatic");
                    break;

                case CMD_PERFORM_NETWORK_SCAN:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_PERFORM_NETWORK_SCAN_DONE, request);
                    getPhoneFromRequest(request).getAvailableNetworks(onCompleted);
                    break;

                case EVENT_PERFORM_NETWORK_SCAN_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    CellNetworkScanResult cellScanResult;
                    if (ar.exception == null && ar.result != null) {
                        cellScanResult = new CellNetworkScanResult(
                                CellNetworkScanResult.STATUS_SUCCESS,
                                (List<OperatorInfo>) ar.result);
                    } else {
                        if (ar.result == null) {
                            loge("getCellNetworkScanResults: Empty response");
                        }
                        if (ar.exception != null) {
                            loge("getCellNetworkScanResults: Exception: " + ar.exception);
                        }
                        int errorCode = CellNetworkScanResult.STATUS_UNKNOWN_ERROR;
                        if (ar.exception instanceof CommandException) {
                            CommandException.Error error =
                                ((CommandException) (ar.exception)).getCommandError();
                            if (error == CommandException.Error.RADIO_NOT_AVAILABLE) {
                                errorCode = CellNetworkScanResult.STATUS_RADIO_NOT_AVAILABLE;
                            } else if (error == CommandException.Error.GENERIC_FAILURE) {
                                errorCode = CellNetworkScanResult.STATUS_RADIO_GENERIC_FAILURE;
                            }
                        }
                        cellScanResult = new CellNetworkScanResult(errorCode, null);
                    }
                    request.result = cellScanResult;
                    notifyRequester(request);
                    break;

                case CMD_SET_NETWORK_SELECTION_MODE_MANUAL:
                    request = (MainThreadRequest) msg.obj;
                    ManualNetworkSelectionArgument selArg =
                            (ManualNetworkSelectionArgument) request.argument;
                    onCompleted = obtainMessage(EVENT_SET_NETWORK_SELECTION_MODE_MANUAL_DONE,
                            request);
                    getPhoneFromRequest(request).selectNetworkManually(selArg.operatorInfo,
                            selArg.persistSelection, onCompleted);
                    break;

                case EVENT_SET_NETWORK_SELECTION_MODE_MANUAL_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null) {
                        request.result = true;
                    } else {
                        request.result = false;
                        loge("setNetworkSelectionModeManual " + ar.exception);
                    }
                    notifyRequester(request);
                    mApp.onNetworkSelectionChanged(request.subId);
                    break;

                case CMD_GET_MODEM_ACTIVITY_INFO:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_GET_MODEM_ACTIVITY_INFO_DONE, request);
                    mPhone.getModemActivityInfo(onCompleted, request.workSource);
                    break;

                case EVENT_GET_MODEM_ACTIVITY_INFO_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        if (ar.result == null) {
                            loge("queryModemActivityInfo: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("queryModemActivityInfo: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("queryModemActivityInfo: Unknown exception");
                        }
                    }
                    // Result cannot be null. Return ModemActivityInfo with all fields set to 0.
                    if (request.result == null) {
                        request.result = new ModemActivityInfo(0, 0, 0, null, 0, 0);
                    }
                    notifyRequester(request);
                    break;

                case CMD_SET_ALLOWED_CARRIERS:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_ALLOWED_CARRIERS_DONE, request);
                    mPhone.setAllowedCarriers(
                            (List<CarrierIdentifier>) request.argument,
                            onCompleted, request.workSource);
                    break;

                case EVENT_SET_ALLOWED_CARRIERS_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        if (ar.result == null) {
                            loge("setAllowedCarriers: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("setAllowedCarriers: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("setAllowedCarriers: Unknown exception");
                        }
                    }
                    // Result cannot be null. Return -1 on error.
                    if (request.result == null) {
                        request.result = new int[]{-1};
                    }
                    notifyRequester(request);
                    break;

                case CMD_GET_ALLOWED_CARRIERS:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_GET_ALLOWED_CARRIERS_DONE, request);
                    mPhone.getAllowedCarriers(onCompleted, request.workSource);
                    break;

                case EVENT_GET_ALLOWED_CARRIERS_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        if (ar.result == null) {
                            loge("getAllowedCarriers: Empty response");
                        } else if (ar.exception instanceof CommandException) {
                            loge("getAllowedCarriers: CommandException: " +
                                    ar.exception);
                        } else {
                            loge("getAllowedCarriers: Unknown exception");
                        }
                    }
                    // Result cannot be null. Return empty list of CarrierIdentifier.
                    if (request.result == null) {
                        request.result = new ArrayList<CarrierIdentifier>(0);
                    }
                    notifyRequester(request);
                    break;

                case EVENT_GET_FORBIDDEN_PLMNS_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null && ar.result != null) {
                        request.result = ar.result;
                    } else {
                        request.result = new IllegalArgumentException(
                                "Failed to retrieve Forbidden Plmns");
                        if (ar.result == null) {
                            loge("getForbiddenPlmns: Empty response");
                        } else {
                            loge("getForbiddenPlmns: Unknown exception");
                        }
                    }
                    notifyRequester(request);
                    break;

                case CMD_GET_FORBIDDEN_PLMNS:
                    request = (MainThreadRequest) msg.obj;
                    uiccCard = getUiccCardFromRequest(request);
                    if (uiccCard == null) {
                        loge("getForbiddenPlmns() UiccCard is null");
                        request.result = new IllegalArgumentException(
                                "getForbiddenPlmns() UiccCard is null");
                        notifyRequester(request);
                        break;
                    }
                    Integer appType = (Integer) request.argument;
                    UiccCardApplication uiccApp = uiccCard.getApplicationByType(appType);
                    if (uiccApp == null) {
                        loge("getForbiddenPlmns() no app with specified type -- "
                                + appType);
                        request.result = new IllegalArgumentException("Failed to get UICC App");
                        notifyRequester(request);
                        break;
                    } else {
                        if (DBG) logv("getForbiddenPlmns() found app " + uiccApp.getAid()
                                + " specified type -- " + appType);
                    }
                    onCompleted = obtainMessage(EVENT_GET_FORBIDDEN_PLMNS_DONE, request);
                    ((SIMRecords) uiccApp.getIccRecords()).getForbiddenPlmns(
                              onCompleted);
                    break;

                case CMD_SWITCH_SLOTS:
                    request = (MainThreadRequest) msg.obj;
                    int[] physicalSlots = (int[]) request.argument;
                    onCompleted = obtainMessage(EVENT_SWITCH_SLOTS_DONE, request);
                    UiccController.getInstance().switchSlots(physicalSlots, onCompleted);
                    break;

                case EVENT_SWITCH_SLOTS_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    request.result = (ar.exception == null);
                    notifyRequester(request);
                    break;
                case CMD_GET_NETWORK_SELECTION_MODE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_GET_NETWORK_SELECTION_MODE_DONE, request);
                    getPhoneFromRequest(request).getNetworkSelectionMode(onCompleted);
                    break;

                case EVENT_GET_NETWORK_SELECTION_MODE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception != null) {
                        request.result = TelephonyManager.NETWORK_SELECTION_MODE_UNKNOWN;
                    } else {
                        int mode = ((int[]) ar.result)[0];
                        if (mode == 0) {
                            request.result = TelephonyManager.NETWORK_SELECTION_MODE_AUTO;
                        } else {
                            request.result = TelephonyManager.NETWORK_SELECTION_MODE_MANUAL;
                        }
                    }
                    notifyRequester(request);
                    break;
                case CMD_GET_CDMA_ROAMING_MODE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_GET_CDMA_ROAMING_MODE_DONE, request);
                    getPhoneFromRequest(request).queryCdmaRoamingPreference(onCompleted);
                    break;
                case EVENT_GET_CDMA_ROAMING_MODE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception != null) {
                        request.result = TelephonyManager.CDMA_ROAMING_MODE_RADIO_DEFAULT;
                    } else {
                        request.result = ((int[]) ar.result)[0];
                    }
                    notifyRequester(request);
                    break;
                case CMD_SET_CDMA_ROAMING_MODE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_CDMA_ROAMING_MODE_DONE, request);
                    int mode = (int) request.argument;
                    getPhoneFromRequest(request).setCdmaRoamingPreference(mode, onCompleted);
                    break;
                case EVENT_SET_CDMA_ROAMING_MODE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    request.result = ar.exception == null;
                    notifyRequester(request);
                    break;
                case CMD_SET_CDMA_SUBSCRIPTION_MODE:
                    request = (MainThreadRequest) msg.obj;
                    onCompleted = obtainMessage(EVENT_SET_CDMA_SUBSCRIPTION_MODE_DONE, request);
                    int subscriptionMode = (int) request.argument;
                    getPhoneFromRequest(request).setCdmaSubscription(subscriptionMode, onCompleted);
                    break;
                case EVENT_SET_CDMA_SUBSCRIPTION_MODE_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    request.result = ar.exception == null;
                    notifyRequester(request);
                    break;

                case CMD_GET_ALL_CELL_INFO:
                    request = (MainThreadRequest) msg.obj;
                    Pair<Phone, WorkSource> args = (Pair<Phone, WorkSource>) request.argument;
                    onCompleted = obtainMessage(EVENT_GET_ALL_CELL_INFO_DONE, request);
                    ((Phone) args.first).getAllCellInfo(args.second, onCompleted);
                    break;

                case EVENT_GET_ALL_CELL_INFO_DONE:
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    // If a timeout occurs, the response will be null
                    request.result = (ar.exception == null && ar.result != null)
                            ? ar.result : new ArrayList<CellInfo>();
                    synchronized (request) {
                        request.notifyAll();
                    }
                    break;

                case CMD_GET_CELL_LOCATION: {
                    request = (MainThreadRequest) msg.obj;
                    WorkSource ws = (WorkSource) request.argument;
                    Phone phone = getPhoneFromRequest(request);
                    phone.getCellLocation(ws, obtainMessage(EVENT_GET_CELL_LOCATION_DONE, request));
                    break;
                }

                case EVENT_GET_CELL_LOCATION_DONE: {
                    ar = (AsyncResult) msg.obj;
                    request = (MainThreadRequest) ar.userObj;
                    if (ar.exception == null) {
                        request.result = ar.result;
                    } else {
                        Phone phone = getPhoneFromRequest(request);
                        request.result = (phone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA)
                                ? new CdmaCellLocation() : new GsmCellLocation();
                    }

                    synchronized (request) {
                        request.notifyAll();
                    }
                    break;
                }

                default:
                    Log.w(LOG_TAG, "MainThreadHandler: unexpected message code: " + msg.what);
                    break;
            }
        }

        private void notifyRequester(MainThreadRequest request) {
            synchronized (request) {
                request.notifyAll();
            }
        }

        private void handleNullReturnEvent(Message msg, String command) {
            AsyncResult ar = (AsyncResult) msg.obj;
            MainThreadRequest request = (MainThreadRequest) ar.userObj;
            if (ar.exception == null) {
                request.result = true;
            } else {
                request.result = false;
                if (ar.exception instanceof CommandException) {
                    loge(command + ": CommandException: " + ar.exception);
                } else {
                    loge(command + ": Unknown exception");
                }
            }
            notifyRequester(request);
        }
    }

    /**
     * Posts the specified command to be executed on the main thread,
     * waits for the request to complete, and returns the result.
     * @see #sendRequestAsync
     */
    private Object sendRequest(int command, Object argument) {
        return sendRequest(command, argument,  SubscriptionManager.INVALID_SUBSCRIPTION_ID, null);
    }

    /**
     * Posts the specified command to be executed on the main thread,
     * waits for the request to complete, and returns the result.
     * @see #sendRequestAsync
     */
    private Object sendRequest(int command, Object argument, WorkSource workSource) {
        return sendRequest(command, argument,  SubscriptionManager.INVALID_SUBSCRIPTION_ID,
                workSource);
    }

    /**
     * Posts the specified command to be executed on the main thread,
     * waits for the request to complete, and returns the result.
     * @see #sendRequestAsync
     */
    private Object sendRequest(int command, Object argument, Integer subId) {
        return sendRequest(command, argument, subId, null);
    }

    /**
     * Posts the specified command to be executed on the main thread,
     * waits for the request to complete, and returns the result.
     * @see #sendRequestAsync
     */
    private Object sendRequest(int command, Object argument, Integer subId, WorkSource workSource) {
        if (Looper.myLooper() == mMainThreadHandler.getLooper()) {
            throw new RuntimeException("This method will deadlock if called from the main thread.");
        }

        MainThreadRequest request = new MainThreadRequest(argument, subId, workSource);
        Message msg = mMainThreadHandler.obtainMessage(command, request);
        msg.sendToTarget();

        // Wait for the request to complete
        synchronized (request) {
            while (request.result == null) {
                try {
                    request.wait();
                } catch (InterruptedException e) {
                    // Do nothing, go back and wait until the request is complete
                }
            }
        }
        return request.result;
    }

    /**
     * Asynchronous ("fire and forget") version of sendRequest():
     * Posts the specified command to be executed on the main thread, and
     * returns immediately.
     * @see #sendRequest
     */
    private void sendRequestAsync(int command) {
        mMainThreadHandler.sendEmptyMessage(command);
    }

    /**
     * Same as {@link #sendRequestAsync(int)} except it takes an argument.
     * @see {@link #sendRequest(int,Object)}
     */
    private void sendRequestAsync(int command, Object argument) {
        MainThreadRequest request = new MainThreadRequest(argument);
        Message msg = mMainThreadHandler.obtainMessage(command, request);
        msg.sendToTarget();
    }

    /**
     * Initialize the singleton PhoneInterfaceManager instance.
     * This is only done once, at startup, from PhoneApp.onCreate().
     */
    /* package */ static PhoneInterfaceManager init(PhoneGlobals app, Phone phone) {
        synchronized (PhoneInterfaceManager.class) {
            if (sInstance == null) {
                sInstance = new PhoneInterfaceManager(app, phone);
            } else {
                Log.wtf(LOG_TAG, "init() called multiple times!  sInstance = " + sInstance);
            }
            return sInstance;
        }
    }

    /** Private constructor; @see init() */
    private PhoneInterfaceManager(PhoneGlobals app, Phone phone) {
        mApp = app;
        mPhone = phone;
        mCM = PhoneGlobals.getInstance().mCM;
        mUserManager = (UserManager) app.getSystemService(Context.USER_SERVICE);
        mAppOps = (AppOpsManager)app.getSystemService(Context.APP_OPS_SERVICE);
        mMainThreadHandler = new MainThreadHandler();
        mTelephonySharedPreferences =
                PreferenceManager.getDefaultSharedPreferences(mPhone.getContext());
        mSubscriptionController = SubscriptionController.getInstance();
        mNetworkScanRequestTracker = new NetworkScanRequestTracker();
        mPhoneConfigurationManager = PhoneConfigurationManager.getInstance();

        publish();
    }

    private void publish() {
        if (DBG) log("publish: " + this);

        ServiceManager.addService("phone", this);
    }

    private Phone getPhoneFromRequest(MainThreadRequest request) {
        return (request.subId == SubscriptionManager.INVALID_SUBSCRIPTION_ID)
                ? mPhone : getPhone(request.subId);
    }

    private UiccCard getUiccCardFromRequest(MainThreadRequest request) {
        Phone phone = getPhoneFromRequest(request);
        return phone == null ? null :
                UiccController.getInstance().getUiccCard(phone.getPhoneId());
    }

    // returns phone associated with the subId.
    private Phone getPhone(int subId) {
        return PhoneFactory.getPhone(mSubscriptionController.getPhoneId(subId));
    }

    public void dial(String number) {
        dialForSubscriber(getPreferredVoiceSubscription(), number);
    }

    public void dialForSubscriber(int subId, String number) {
        if (DBG) log("dial: " + number);
        // No permission check needed here: This is just a wrapper around the
        // ACTION_DIAL intent, which is available to any app since it puts up
        // the UI before it does anything.

        final long identity = Binder.clearCallingIdentity();
        try {
            String url = createTelUrl(number);
            if (url == null) {
                return;
            }

            // PENDING: should we just silently fail if phone is offhook or ringing?
            PhoneConstants.State state = mCM.getState(subId);
            if (state != PhoneConstants.State.OFFHOOK && state != PhoneConstants.State.RINGING) {
                Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                mApp.startActivity(intent);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public void call(String callingPackage, String number) {
        callForSubscriber(getPreferredVoiceSubscription(), callingPackage, number);
    }

    public void callForSubscriber(int subId, String callingPackage, String number) {
        if (DBG) log("call: " + number);

        // This is just a wrapper around the ACTION_CALL intent, but we still
        // need to do a permission check since we're calling startActivity()
        // from the context of the phone app.
        enforceCallPermission();

        if (mAppOps.noteOp(AppOpsManager.OP_CALL_PHONE, Binder.getCallingUid(), callingPackage)
                != AppOpsManager.MODE_ALLOWED) {
            return;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            String url = createTelUrl(number);
            if (url == null) {
                return;
            }

            boolean isValid = false;
            final List<SubscriptionInfo> slist = getActiveSubscriptionInfoListPrivileged();
            if (slist != null) {
                for (SubscriptionInfo subInfoRecord : slist) {
                    if (subInfoRecord.getSubscriptionId() == subId) {
                        isValid = true;
                        break;
                    }
                }
            }
            if (!isValid) {
                return;
            }

            Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse(url));
            intent.putExtra(SUBSCRIPTION_KEY, subId);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            mApp.startActivity(intent);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean supplyPin(String pin) {
        return supplyPinForSubscriber(getDefaultSubscription(), pin);
    }

    public boolean supplyPinForSubscriber(int subId, String pin) {
        int [] resultArray = supplyPinReportResultForSubscriber(subId, pin);
        return (resultArray[0] == PhoneConstants.PIN_RESULT_SUCCESS) ? true : false;
    }

    public boolean supplyPuk(String puk, String pin) {
        return supplyPukForSubscriber(getDefaultSubscription(), puk, pin);
    }

    public boolean supplyPukForSubscriber(int subId, String puk, String pin) {
        int [] resultArray = supplyPukReportResultForSubscriber(subId, puk, pin);
        return (resultArray[0] == PhoneConstants.PIN_RESULT_SUCCESS) ? true : false;
    }

    /** {@hide} */
    public int[] supplyPinReportResult(String pin) {
        return supplyPinReportResultForSubscriber(getDefaultSubscription(), pin);
    }

    public int[] supplyPinReportResultForSubscriber(int subId, String pin) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final UnlockSim checkSimPin = new UnlockSim(getPhone(subId).getIccCard());
            checkSimPin.start();
            return checkSimPin.unlockSim(null, pin);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /** {@hide} */
    public int[] supplyPukReportResult(String puk, String pin) {
        return supplyPukReportResultForSubscriber(getDefaultSubscription(), puk, pin);
    }

    public int[] supplyPukReportResultForSubscriber(int subId, String puk, String pin) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final UnlockSim checkSimPuk = new UnlockSim(getPhone(subId).getIccCard());
            checkSimPuk.start();
            return checkSimPuk.unlockSim(puk, pin);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Helper thread to turn async call to SimCard#supplyPin into
     * a synchronous one.
     */
    private static class UnlockSim extends Thread {

        private final IccCard mSimCard;

        private boolean mDone = false;
        private int mResult = PhoneConstants.PIN_GENERAL_FAILURE;
        private int mRetryCount = -1;

        // For replies from SimCard interface
        private Handler mHandler;

        // For async handler to identify request type
        private static final int SUPPLY_PIN_COMPLETE = 100;

        public UnlockSim(IccCard simCard) {
            mSimCard = simCard;
        }

        @Override
        public void run() {
            Looper.prepare();
            synchronized (UnlockSim.this) {
                mHandler = new Handler() {
                    @Override
                    public void handleMessage(Message msg) {
                        AsyncResult ar = (AsyncResult) msg.obj;
                        switch (msg.what) {
                            case SUPPLY_PIN_COMPLETE:
                                Log.d(LOG_TAG, "SUPPLY_PIN_COMPLETE");
                                synchronized (UnlockSim.this) {
                                    mRetryCount = msg.arg1;
                                    if (ar.exception != null) {
                                        if (ar.exception instanceof CommandException &&
                                                ((CommandException)(ar.exception)).getCommandError()
                                                == CommandException.Error.PASSWORD_INCORRECT) {
                                            mResult = PhoneConstants.PIN_PASSWORD_INCORRECT;
                                        } else {
                                            mResult = PhoneConstants.PIN_GENERAL_FAILURE;
                                        }
                                    } else {
                                        mResult = PhoneConstants.PIN_RESULT_SUCCESS;
                                    }
                                    mDone = true;
                                    UnlockSim.this.notifyAll();
                                }
                                break;
                        }
                    }
                };
                UnlockSim.this.notifyAll();
            }
            Looper.loop();
        }

        /*
         * Use PIN or PUK to unlock SIM card
         *
         * If PUK is null, unlock SIM card with PIN
         *
         * If PUK is not null, unlock SIM card with PUK and set PIN code
         */
        synchronized int[] unlockSim(String puk, String pin) {

            while (mHandler == null) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            }
            Message callback = Message.obtain(mHandler, SUPPLY_PIN_COMPLETE);

            if (puk == null) {
                mSimCard.supplyPin(pin, callback);
            } else {
                mSimCard.supplyPuk(puk, pin, callback);
            }

            while (!mDone) {
                try {
                    Log.d(LOG_TAG, "wait for done");
                    wait();
                } catch (InterruptedException e) {
                    // Restore the interrupted status
                    Thread.currentThread().interrupt();
                }
            }
            Log.d(LOG_TAG, "done");
            int[] resultArray = new int[2];
            resultArray[0] = mResult;
            resultArray[1] = mRetryCount;
            return resultArray;
        }
    }

    public void updateServiceLocation() {
        updateServiceLocationForSubscriber(getDefaultSubscription());

    }

    public void updateServiceLocationForSubscriber(int subId) {
        // No permission check needed here: this call is harmless, and it's
        // needed for the ServiceState.requestStateUpdate() call (which is
        // already intentionally exposed to 3rd parties.)
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.updateServiceLocation();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isRadioOn(String callingPackage) {
        return isRadioOnForSubscriber(getDefaultSubscription(), callingPackage);
    }

    @Override
    public boolean isRadioOnForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "isRadioOnForSubscriber")) {
            return false;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return isRadioOnForSubscriber(subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private boolean isRadioOnForSubscriber(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getServiceState().getState() != ServiceState.STATE_POWER_OFF;
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public void toggleRadioOnOff() {
        toggleRadioOnOffForSubscriber(getDefaultSubscription());
    }

    public void toggleRadioOnOffForSubscriber(int subId) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setRadioPower(!isRadioOnForSubscriber(subId));
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean setRadio(boolean turnOn) {
        return setRadioForSubscriber(getDefaultSubscription(), turnOn);
    }

    public boolean setRadioForSubscriber(int subId, boolean turnOn) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                return false;
            }
            if ((phone.getServiceState().getState() != ServiceState.STATE_POWER_OFF) != turnOn) {
                toggleRadioOnOffForSubscriber(subId);
            }
            return true;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean needMobileRadioShutdown() {
        /*
         * If any of the Radios are available, it will need to be
         * shutdown. So return true if any Radio is available.
         */
        final long identity = Binder.clearCallingIdentity();
        try {
            for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) {
                Phone phone = PhoneFactory.getPhone(i);
                if (phone != null && phone.isRadioAvailable()) return true;
            }
            logv(TelephonyManager.getDefault().getPhoneCount() + " Phones are shutdown.");
            return false;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void shutdownMobileRadios() {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) {
                logv("Shutting down Phone " + i);
                shutdownRadioUsingPhoneId(i);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private void shutdownRadioUsingPhoneId(int phoneId) {
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone != null && phone.isRadioAvailable()) {
            phone.shutdownRadio();
        }
    }

    public boolean setRadioPower(boolean turnOn) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone defaultPhone = PhoneFactory.getDefaultPhone();
            if (defaultPhone != null) {
                defaultPhone.setRadioPower(turnOn);
                return true;
            } else {
                loge("There's no default phone.");
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean setRadioPowerForSubscriber(int subId, boolean turnOn) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setRadioPower(turnOn);
                return true;
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    // FIXME: subId version needed
    @Override
    public boolean enableDataConnectivity() {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            int subId = mSubscriptionController.getDefaultDataSubId();
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setUserDataEnabled(true);
                return true;
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    // FIXME: subId version needed
    @Override
    public boolean disableDataConnectivity() {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            int subId = mSubscriptionController.getDefaultDataSubId();
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setUserDataEnabled(false);
                return true;
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isDataConnectivityPossible(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.isDataAllowed();
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean handlePinMmi(String dialString) {
        return handlePinMmiForSubscriber(getDefaultSubscription(), dialString);
    }

    public void handleUssdRequest(int subId, String ussdRequest, ResultReceiver wrappedCallback) {
        enforceCallPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            if (!SubscriptionManager.isValidSubscriptionId(subId)) {
                return;
            }
            Pair<String, ResultReceiver> ussdObject = new Pair(ussdRequest, wrappedCallback);
            sendRequest(CMD_HANDLE_USSD_REQUEST, ussdObject, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    };

    public boolean handlePinMmiForSubscriber(int subId, String dialString) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            if (!SubscriptionManager.isValidSubscriptionId(subId)) {
                return false;
            }
            return (Boolean) sendRequest(CMD_HANDLE_PIN_MMI, dialString, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public int getCallState() {
        return getCallStateForSlot(getSlotForDefaultSubscription());
    }

    public int getCallStateForSlot(int slotIndex) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = PhoneFactory.getPhone(slotIndex);
            return phone == null ? TelephonyManager.CALL_STATE_IDLE :
                    PhoneConstantConversions.convertCallState(phone.getState());
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getDataState() {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(mSubscriptionController.getDefaultDataSubId());
            if (phone != null) {
                return PhoneConstantConversions.convertDataState(phone.getDataConnectionState());
            } else {
                return PhoneConstantConversions.convertDataState(
                        PhoneConstants.DataState.DISCONNECTED);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getDataActivity() {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(mSubscriptionController.getDefaultDataSubId());
            if (phone != null) {
                return DefaultPhoneNotifier.convertDataActivityState(phone.getDataActivityState());
            } else {
                return TelephonyManager.DATA_ACTIVITY_NONE;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public Bundle getCellLocation(String callingPackage) {
        mPhone.getContext().getSystemService(AppOpsManager.class)
                .checkPackage(Binder.getCallingUid(), callingPackage);
        if (!LocationAccessPolicy.canAccessCellLocation(mPhone.getContext(),
                callingPackage, Binder.getCallingUid(), Binder.getCallingPid(), true)) {
            return null;
        }

        WorkSource workSource = getWorkSource(Binder.getCallingUid());
        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG_LOC) log("getCellLocation: is active user");
            Bundle data = new Bundle();
            int subId = mSubscriptionController.getDefaultDataSubId();
            CellLocation cl = (CellLocation) sendRequest(CMD_GET_CELL_LOCATION, workSource, subId);
            cl.fillInNotifierBundle(data);
            return data;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getNetworkCountryIsoForPhone(int phoneId) {
        // Reporting the correct network country is ambiguous when IWLAN could conflict with
        // registered cell info, so return a NULL country instead.
        final long identity = Binder.clearCallingIdentity();
        try {
            if (phoneId == SubscriptionManager.INVALID_PHONE_INDEX) {
                // Get default phone in this case.
                phoneId = SubscriptionManager.DEFAULT_PHONE_INDEX;
            }
            final int subId = mSubscriptionController.getSubIdUsingPhoneId(phoneId);
            // Todo: fix this when we can get the actual cellular network info when the device
            // is on IWLAN.
            if (TelephonyManager.NETWORK_TYPE_IWLAN
                    == getVoiceNetworkTypeForSubscriber(subId, mApp.getPackageName())) {
                return "";
            }
            Phone phone = PhoneFactory.getPhone(phoneId);
            if (phone != null) {
                ServiceStateTracker sst = phone.getServiceStateTracker();
                if (sst != null) {
                    LocaleTracker lt = sst.getLocaleTracker();
                    if (lt != null) {
                        return lt.getCurrentCountry();
                    }
                }
            }
            return "";
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void enableLocationUpdates() {
        enableLocationUpdatesForSubscriber(getDefaultSubscription());
    }

    @Override
    public void enableLocationUpdatesForSubscriber(int subId) {
        mApp.enforceCallingOrSelfPermission(
                android.Manifest.permission.CONTROL_LOCATION_UPDATES, null);

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.enableLocationUpdates();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void disableLocationUpdates() {
        disableLocationUpdatesForSubscriber(getDefaultSubscription());
    }

    @Override
    public void disableLocationUpdatesForSubscriber(int subId) {
        mApp.enforceCallingOrSelfPermission(
                android.Manifest.permission.CONTROL_LOCATION_UPDATES, null);

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.disableLocationUpdates();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<NeighboringCellInfo>
            getNeighboringCellInfo(String callingPackage, int targetSdk) {
        if (targetSdk >= android.os.Build.VERSION_CODES.Q) {
            throw new SecurityException(
                    "getNeighboringCellInfo() is unavailable to callers targeting Q+ SDK levels.");
        }

        if (mAppOps.noteOp(AppOpsManager.OP_NEIGHBORING_CELLS, Binder.getCallingUid(),
                callingPackage) != AppOpsManager.MODE_ALLOWED) {
            return null;
        }

        if (DBG_LOC) log("getNeighboringCellInfo: is active user");

        List<CellInfo> info = getAllCellInfo(callingPackage);
        if (info == null) return null;

        List<NeighboringCellInfo> neighbors = new ArrayList<NeighboringCellInfo>();
        for (CellInfo ci : info) {
            if (ci instanceof CellInfoGsm) {
                neighbors.add(new NeighboringCellInfo((CellInfoGsm) ci));
            } else if (ci instanceof CellInfoWcdma) {
                neighbors.add(new NeighboringCellInfo((CellInfoWcdma) ci));
            }
        }
        return (neighbors.size()) > 0 ? neighbors : null;
    }


    @Override
    public List<CellInfo> getAllCellInfo(String callingPackage) {
        mPhone.getContext().getSystemService(AppOpsManager.class)
                .checkPackage(Binder.getCallingUid(), callingPackage);
        if (!LocationAccessPolicy.canAccessCellLocation(mPhone.getContext(),
                callingPackage, Binder.getCallingUid(), Binder.getCallingPid(), true)) {
            return null;
        }

        if (DBG_LOC) log("getAllCellInfo: is active user");
        WorkSource workSource = getWorkSource(Binder.getCallingUid());
        final long identity = Binder.clearCallingIdentity();
        try {
            List<CellInfo> cellInfos = new ArrayList<CellInfo>();
            for (Phone phone : PhoneFactory.getPhones()) {
                final List<CellInfo> info = (List<CellInfo>) sendRequest(
                        CMD_GET_ALL_CELL_INFO,
                        new Pair<Phone, WorkSource>(phone, workSource));
                if (info != null) cellInfos.addAll(info);
            }
            return cellInfos;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setCellInfoListRate(int rateInMillis) {
        enforceModifyPermission();
        WorkSource workSource = getWorkSource(Binder.getCallingUid());

        final long identity = Binder.clearCallingIdentity();
        try {
            mPhone.setCellInfoListRate(rateInMillis, workSource);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getImeiForSlot(int slotIndex, String callingPackage) {
        Phone phone = PhoneFactory.getPhone(slotIndex);
        if (phone == null) {
            return null;
        }
        int subId = phone.getSubId();
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getImeiForSlot")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return phone.getImei();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getTypeAllocationCodeForSlot(int slotIndex) {
        Phone phone = PhoneFactory.getPhone(slotIndex);
        String tac = null;
        if (phone != null) {
            String imei = phone.getImei();
            tac = imei == null ? null : imei.substring(0, TYPE_ALLOCATION_CODE_LENGTH);
        }
        return tac;
    }

    @Override
    public String getMeidForSlot(int slotIndex, String callingPackage) {
        Phone phone = PhoneFactory.getPhone(slotIndex);
        if (phone == null) {
            return null;
        }
        int subId = phone.getSubId();
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getMeidForSlot")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return phone.getMeid();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getManufacturerCodeForSlot(int slotIndex) {
        Phone phone = PhoneFactory.getPhone(slotIndex);
        String manufacturerCode = null;
        if (phone != null) {
            String meid = phone.getMeid();
            manufacturerCode = meid == null ? null : meid.substring(0, MANUFACTURER_CODE_LENGTH);
        }
        return manufacturerCode;
    }

    @Override
    public String getDeviceSoftwareVersionForSlot(int slotIndex, String callingPackage) {
        Phone phone = PhoneFactory.getPhone(slotIndex);
        if (phone == null) {
            return null;
        }
        int subId = phone.getSubId();
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getDeviceSoftwareVersionForSlot")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return phone.getDeviceSvn();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getSubscriptionCarrierId(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            return phone == null ? TelephonyManager.UNKNOWN_CARRIER_ID : phone.getCarrierId();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getSubscriptionCarrierName(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            return phone == null ? null : phone.getCarrierName();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    //
    // Internal helper methods.
    //

    /**
     * Make sure the caller has the MODIFY_PHONE_STATE permission.
     *
     * @throws SecurityException if the caller does not have the required permission
     */
    private void enforceModifyPermission() {
        mApp.enforceCallingOrSelfPermission(android.Manifest.permission.MODIFY_PHONE_STATE, null);
    }

    /**
     * Make sure the caller has the CALL_PHONE permission.
     *
     * @throws SecurityException if the caller does not have the required permission
     */
    private void enforceCallPermission() {
        mApp.enforceCallingOrSelfPermission(android.Manifest.permission.CALL_PHONE, null);
    }

    private void enforceConnectivityInternalPermission() {
        mApp.enforceCallingOrSelfPermission(
                android.Manifest.permission.CONNECTIVITY_INTERNAL,
                "ConnectivityService");
    }

    private String createTelUrl(String number) {
        if (TextUtils.isEmpty(number)) {
            return null;
        }

        return "tel:" + number;
    }

    private static void log(String msg) {
        Log.d(LOG_TAG, "[PhoneIntfMgr] " + msg);
    }

    private static void logv(String msg) {
        Log.v(LOG_TAG, "[PhoneIntfMgr] " + msg);
    }

    private static void loge(String msg) {
        Log.e(LOG_TAG, "[PhoneIntfMgr] " + msg);
    }

    @Override
    public int getActivePhoneType() {
        return getActivePhoneTypeForSlot(getSlotForDefaultSubscription());
    }

    @Override
    public int getActivePhoneTypeForSlot(int slotIndex) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = PhoneFactory.getPhone(slotIndex);
            if (phone == null) {
                return PhoneConstants.PHONE_TYPE_NONE;
            } else {
                return phone.getPhoneType();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the CDMA ERI icon index to display
     */
    @Override
    public int getCdmaEriIconIndex(String callingPackage) {
        return getCdmaEriIconIndexForSubscriber(getDefaultSubscription(), callingPackage);
    }

    @Override
    public int getCdmaEriIconIndexForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getCdmaEriIconIndexForSubscriber")) {
            return -1;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getCdmaEriIconIndex();
            } else {
                return -1;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the CDMA ERI icon mode,
     * 0 - ON
     * 1 - FLASHING
     */
    @Override
    public int getCdmaEriIconMode(String callingPackage) {
        return getCdmaEriIconModeForSubscriber(getDefaultSubscription(), callingPackage);
    }

    @Override
    public int getCdmaEriIconModeForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getCdmaEriIconModeForSubscriber")) {
            return -1;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getCdmaEriIconMode();
            } else {
                return -1;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the CDMA ERI text,
     */
    @Override
    public String getCdmaEriText(String callingPackage) {
        return getCdmaEriTextForSubscriber(getDefaultSubscription(), callingPackage);
    }

    @Override
    public String getCdmaEriTextForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getCdmaEriIconTextForSubscriber")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getCdmaEriText();
            } else {
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the CDMA MDN.
     */
    @Override
    public String getCdmaMdn(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "getCdmaMdn");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (mPhone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA && phone != null) {
                return phone.getLine1Number();
            } else {
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the CDMA MIN.
     */
    @Override
    public String getCdmaMin(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "getCdmaMin");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null && phone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA) {
                return phone.getCdmaMin();
            } else {
                return null;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns true if CDMA provisioning needs to run.
     */
    public boolean needsOtaServiceProvisioning() {
        final long identity = Binder.clearCallingIdentity();
        try {
            return mPhone.needsOtaServiceProvisioning();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Sets the voice mail number of a given subId.
     */
    @Override
    public boolean setVoiceMailNumber(int subId, String alphaTag, String number) {
        TelephonyPermissions.enforceCallingOrSelfCarrierPrivilege(subId, "setVoiceMailNumber");

        final long identity = Binder.clearCallingIdentity();
        try {
            Boolean success = (Boolean) sendRequest(CMD_SET_VOICEMAIL_NUMBER,
                    new Pair<String, String>(alphaTag, number), new Integer(subId));
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public Bundle getVisualVoicemailSettings(String callingPackage, int subId) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        String systemDialer = TelecomManager.from(mPhone.getContext()).getSystemDialerPackage();
        if (!TextUtils.equals(callingPackage, systemDialer)) {
            throw new SecurityException("caller must be system dialer");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            PhoneAccountHandle phoneAccountHandle = PhoneAccountHandleConverter.fromSubId(subId);
            if (phoneAccountHandle == null) {
                return null;
            }
            return VisualVoicemailSettingsUtil.dump(mPhone.getContext(), phoneAccountHandle);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getVisualVoicemailPackageName(String callingPackage, int subId) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getVisualVoicemailPackageName")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return RemoteVvmTaskManager
                    .getRemotePackage(mPhone.getContext(), subId).getPackageName();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void enableVisualVoicemailSmsFilter(String callingPackage, int subId,
            VisualVoicemailSmsFilterSettings settings) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);

        final long identity = Binder.clearCallingIdentity();
        try {
            VisualVoicemailSmsFilterConfig.enableVisualVoicemailSmsFilter(
                    mPhone.getContext(), callingPackage, subId, settings);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void disableVisualVoicemailSmsFilter(String callingPackage, int subId) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);

        final long identity = Binder.clearCallingIdentity();
        try {
            VisualVoicemailSmsFilterConfig.disableVisualVoicemailSmsFilter(
                    mPhone.getContext(), callingPackage, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public VisualVoicemailSmsFilterSettings getVisualVoicemailSmsFilterSettings(
            String callingPackage, int subId) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);

        final long identity = Binder.clearCallingIdentity();
        try {
            return VisualVoicemailSmsFilterConfig.getVisualVoicemailSmsFilterSettings(
                    mPhone.getContext(), callingPackage, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public VisualVoicemailSmsFilterSettings getActiveVisualVoicemailSmsFilterSettings(int subId) {
        enforceReadPrivilegedPermission("getActiveVisualVoicemailSmsFilterSettings");

        final long identity = Binder.clearCallingIdentity();
        try {
            return VisualVoicemailSmsFilterConfig.getActiveVisualVoicemailSmsFilterSettings(
                    mPhone.getContext(), subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void sendVisualVoicemailSmsForSubscriber(String callingPackage, int subId,
            String number, int port, String text, PendingIntent sentIntent) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        enforceVisualVoicemailPackage(callingPackage, subId);
        enforceSendSmsPermission();
        // Make the calls as the phone process.
        final long identity = Binder.clearCallingIdentity();
        try {
            SmsManager smsManager = SmsManager.getSmsManagerForSubscriptionId(subId);
            if (port == 0) {
                smsManager.sendTextMessageWithSelfPermissions(number, null, text,
                        sentIntent, null, false);
            } else {
                byte[] data = text.getBytes(StandardCharsets.UTF_8);
                smsManager.sendDataMessageWithSelfPermissions(number, null,
                        (short) port, data, sentIntent, null);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }
    /**
     * Sets the voice activation state of a given subId.
     */
    @Override
    public void setVoiceActivationState(int subId, int activationState) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setVoiceActivationState");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setVoiceActivationState(activationState);
            } else {
                loge("setVoiceActivationState fails with invalid subId: " + subId);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Sets the data activation state of a given subId.
     */
    @Override
    public void setDataActivationState(int subId, int activationState) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setDataActivationState");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setDataActivationState(activationState);
            } else {
                loge("setVoiceActivationState fails with invalid subId: " + subId);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the voice activation state of a given subId.
     */
    @Override
    public int getVoiceActivationState(int subId, String callingPackage) {
        enforceReadPrivilegedPermission("getVoiceActivationState");

        final Phone phone = getPhone(subId);
        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone != null) {
                return phone.getVoiceActivationState();
            } else {
                return TelephonyManager.SIM_ACTIVATION_STATE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the data activation state of a given subId.
     */
    @Override
    public int getDataActivationState(int subId, String callingPackage) {
        enforceReadPrivilegedPermission("getDataActivationState");

        final Phone phone = getPhone(subId);
        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone != null) {
                return phone.getDataActivationState();
            } else {
                return TelephonyManager.SIM_ACTIVATION_STATE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the unread count of voicemails
     */
    public int getVoiceMessageCount() {
        return getVoiceMessageCountForSubscriber(getDefaultSubscription());
    }

    /**
     * Returns the unread count of voicemails for a subId
     */
    @Override
    public int getVoiceMessageCountForSubscriber( int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getVoiceMessageCount();
            } else {
                return 0;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
      * returns true, if the device is in a state where both voice and data
      * are supported simultaneously. This can change based on location or network condition.
     */
    @Override
    public boolean isConcurrentVoiceAndDataAllowed(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            return (phone == null ? false : phone.isConcurrentVoiceAndDataAllowed());
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Send the dialer code if called from the current default dialer or the caller has
     * carrier privilege.
     * @param inputCode The dialer code to send
     */
    @Override
    public void sendDialerSpecialCode(String callingPackage, String inputCode) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        String defaultDialer = TelecomManager.from(mPhone.getContext()).getDefaultDialerPackage();
        if (!TextUtils.equals(callingPackage, defaultDialer)) {
            TelephonyPermissions.enforceCallingOrSelfCarrierPrivilege(
                    getDefaultSubscription(), "sendDialerSpecialCode");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            mPhone.sendDialerSpecialCode(inputCode);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the data network type.
     * Legacy call, permission-free.
     *
     * @Deprecated to be removed Q3 2013 use {@link #getDataNetworkType}.
     */
    @Override
    public int getNetworkType() {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(getDefaultSubscription());
            if (phone != null) {
                return phone.getServiceState().getDataNetworkType();
            } else {
                return TelephonyManager.NETWORK_TYPE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getNetworkSelectionMode(int subId) {
        if (!isActiveSubscription(subId)) {
            return TelephonyManager.NETWORK_SELECTION_MODE_UNKNOWN;
        }

        return (int) sendRequest(CMD_GET_NETWORK_SELECTION_MODE, null /* argument */, subId);
    }

    @Override
    public void addImsRegistrationCallback(int subId, IImsRegistrationCallback c,
            String callingPackage) throws RemoteException {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "addImsRegistrationCallback")) {
            return;
        }
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        final long token = Binder.clearCallingIdentity();
        try {
            ImsManager.getInstance(mPhone.getContext(), getSlotIndexOrException(subId))
                    .addRegistrationCallbackForSubscription(c, subId);
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    @Override
    public void removeImsRegistrationCallback(int subId, IImsRegistrationCallback c,
            String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "removeImsRegistrationCallback")) {
            return;
        }
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        Binder.withCleanCallingIdentity(() ->
                ImsManager.getInstance(mPhone.getContext(), getSlotIndexOrException(subId))
                        .removeRegistrationCallbackForSubscription(c, subId));
    }

    @Override
    public void addMmTelCapabilityCallback(int subId, IImsCapabilityCallback c,
            String callingPackage) throws RemoteException {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "addMmTelCapabilityCallback")) {
            return;
        }
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        final long token = Binder.clearCallingIdentity();
        try {
            ImsManager.getInstance(mPhone.getContext(), getSlotIndexOrException(subId))
                    .addCapabilitiesCallbackForSubscription(c, subId);
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    @Override
    public void removeMmTelCapabilityCallback(int subId, IImsCapabilityCallback c,
            String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "removeMmTelCapabilityCallback")) {
            return;
        }
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        Binder.withCleanCallingIdentity(() ->
                ImsManager.getInstance(mPhone.getContext(), getSlotIndexOrException(subId))
                        .removeCapabilitiesCallbackForSubscription(c, subId));
    }

    @Override
    public boolean isCapable(int subId, int capability, int regTech, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "isCapable")) {
            return false;
        }
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        final long token = Binder.clearCallingIdentity();
        try {
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).queryMmTelCapability(capability, regTech);
        } catch (ImsException e) {
            Log.w(LOG_TAG, "IMS isCapable - service unavailable: " + e.getMessage());
            return false;
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    @Override
    public boolean isAvailable(int subId, int capability, int regTech, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "isAvailable")) {
            return false;
        }
        final long token = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone == null) return false;
            return phone.isImsCapabilityAvailable(capability, regTech);
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    @Override
    public boolean isAdvancedCallingSettingEnabled(int subId) {
        enforceReadPrivilegedPermission("enforceReadPrivilegedPermission");
        // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
        final long token = Binder.clearCallingIdentity();
        try {
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).isEnhanced4gLteModeSettingEnabledByUser();
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    @Override
    public void setAdvancedCallingSetting(int subId, boolean isEnabled) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setAdvancedCallingSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setEnhanced4gLteModeSetting(isEnabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isVtSettingEnabled(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(mApp, subId, callingPackage,
                "isVtSettingEnabled")) {
            return false;
        }
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).isVtEnabledByUser();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVtSetting(int subId, boolean isEnabled) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVtSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setVtSetting(isEnabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isVoWiFiSettingEnabled(int subId) {
        enforceReadPrivilegedPermission("isVoWiFiSettingEnabled");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).isWfcEnabledByUser();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVoWiFiSetting(int subId, boolean isEnabled) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVoWiFiSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setWfcSetting(isEnabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isVoWiFiRoamingSettingEnabled(int subId) {
        enforceReadPrivilegedPermission("isVoWiFiRoamingSettingEnabled");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).isWfcRoamingEnabledByUser();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVoWiFiRoamingSetting(int subId, boolean isEnabled) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVoWiFiRoamingSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setWfcRoamingSetting(isEnabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVoWiFiNonPersistent(int subId, boolean isCapable, int mode) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVoWiFiNonPersistent");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setWfcNonPersistent(isCapable, mode);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getVoWiFiModeSetting(int subId) {
        enforceReadPrivilegedPermission("getVoWiFiModeSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).getWfcMode(false /*isRoaming*/);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVoWiFiModeSetting(int subId, int mode) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVoWiFiModeSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setWfcMode(mode, false /*isRoaming*/);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getVoWiFiRoamingModeSetting(int subId) {
        enforceReadPrivilegedPermission("getVoWiFiRoamingModeSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).getWfcMode(true /*isRoaming*/);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setVoWiFiRoamingModeSetting(int subId, int mode) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setVoWiFiRoamingModeSetting");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setWfcMode(mode, true /*isRoaming*/);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setRttCapabilitySetting(int subId, boolean isEnabled) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp, subId,
                "setRttCapabilityEnabled");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).setRttEnabled(isEnabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isTtyOverVolteEnabled(int subId) {
        enforceReadPrivilegedPermission("isTtyOverVolteEnabled");
        final long identity = Binder.clearCallingIdentity();
        try {
            // TODO: Refactor to remove ImsManager dependence and query through ImsPhone directly.
            return ImsManager.getInstance(mPhone.getContext(),
                    getSlotIndexOrException(subId)).isTtyOnVoLteCapable();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private int getSlotIndexOrException(int subId) throws IllegalArgumentException {
        int slotId = SubscriptionManager.getSlotIndex(subId);
        if (!SubscriptionManager.isValidSlotIndex(slotId)) {
            throw new IllegalArgumentException("Invalid Subscription Id.");
        }
        return slotId;
    }

    /**
     * Returns the network type for a subId
     */
    @Override
    public int getNetworkTypeForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getNetworkTypeForSubscriber")) {
            return TelephonyManager.NETWORK_TYPE_UNKNOWN;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getServiceState().getDataNetworkType();
            } else {
                return TelephonyManager.NETWORK_TYPE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the data network type
     */
    @Override
    public int getDataNetworkType(String callingPackage) {
        return getDataNetworkTypeForSubscriber(getDefaultSubscription(), callingPackage);
    }

    /**
     * Returns the data network type for a subId
     */
    @Override
    public int getDataNetworkTypeForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getDataNetworkTypeForSubscriber")) {
            return TelephonyManager.NETWORK_TYPE_UNKNOWN;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getServiceState().getDataNetworkType();
            } else {
                return TelephonyManager.NETWORK_TYPE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the Voice network type for a subId
     */
    @Override
    public int getVoiceNetworkTypeForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getDataNetworkTypeForSubscriber")) {
            return TelephonyManager.NETWORK_TYPE_UNKNOWN;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getServiceState().getVoiceNetworkType();
            } else {
                return TelephonyManager.NETWORK_TYPE_UNKNOWN;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * @return true if a ICC card is present
     */
    public boolean hasIccCard() {
        // FIXME Make changes to pass defaultSimId of type int
        return hasIccCardUsingSlotIndex(mSubscriptionController.getSlotIndex(
                getDefaultSubscription()));
    }

    /**
     * @return true if a ICC card is present for a slotIndex
     */
    @Override
    public boolean hasIccCardUsingSlotIndex(int slotIndex) {
        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = PhoneFactory.getPhone(slotIndex);
            if (phone != null) {
                return phone.getIccCard().hasIccCard();
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Return if the current radio is LTE on CDMA. This
     * is a tri-state return value as for a period of time
     * the mode may be unknown.
     *
     * @param callingPackage the name of the package making the call.
     * @return {@link Phone#LTE_ON_CDMA_UNKNOWN}, {@link Phone#LTE_ON_CDMA_FALSE}
     * or {@link Phone#LTE_ON_CDMA_TRUE}
     */
    @Override
    public int getLteOnCdmaMode(String callingPackage) {
        return getLteOnCdmaModeForSubscriber(getDefaultSubscription(), callingPackage);
    }

    @Override
    public int getLteOnCdmaModeForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getLteOnCdmaModeForSubscriber")) {
            return PhoneConstants.LTE_ON_CDMA_UNKNOWN;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                return PhoneConstants.LTE_ON_CDMA_UNKNOWN;
            } else {
                return phone.getLteOnCdmaMode();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public void setPhone(Phone phone) {
        mPhone = phone;
    }

    /**
     * {@hide}
     * Returns Default subId, 0 in the case of single standby.
     */
    private int getDefaultSubscription() {
        return mSubscriptionController.getDefaultSubId();
    }

    private int getSlotForDefaultSubscription() {
        return mSubscriptionController.getPhoneId(getDefaultSubscription());
    }

    private int getPreferredVoiceSubscription() {
        return mSubscriptionController.getDefaultVoiceSubId();
    }

    private boolean isActiveSubscription(int subId) {
        return mSubscriptionController.isActiveSubId(subId);
    }

    /**
     * @see android.telephony.TelephonyManager.WifiCallingChoices
     */
    public int getWhenToMakeWifiCalls() {
        final long identity = Binder.clearCallingIdentity();
        try {
            return Settings.System.getInt(mPhone.getContext().getContentResolver(),
                    Settings.System.WHEN_TO_MAKE_WIFI_CALLS,
                    getWhenToMakeWifiCallsDefaultPreference());
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * @see android.telephony.TelephonyManager.WifiCallingChoices
     */
    public void setWhenToMakeWifiCalls(int preference) {
        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("setWhenToMakeWifiCallsStr, storing setting = " + preference);
            Settings.System.putInt(mPhone.getContext().getContentResolver(),
                    Settings.System.WHEN_TO_MAKE_WIFI_CALLS, preference);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private static int getWhenToMakeWifiCallsDefaultPreference() {
        // TODO: Use a build property to choose this value.
        return TelephonyManager.WifiCallingChoices.ALWAYS_USE;
    }

    @Override
    public IccOpenLogicalChannelResponse iccOpenLogicalChannel(
            int subId, String callingPackage, String aid, int p2) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "iccOpenLogicalChannel");
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (TextUtils.equals(ISDR_AID, aid)) {
                // Only allows LPA to open logical channel to ISD-R.
                ComponentInfo bestComponent =
                        EuiccConnector.findBestComponent(mPhone.getContext().getPackageManager());
                if (bestComponent == null
                        || !TextUtils.equals(callingPackage, bestComponent.packageName)) {
                    loge("The calling package is not allowed to access ISD-R.");
                    throw new SecurityException(
                            "The calling package is not allowed to access ISD-R.");
                }
            }

            if (DBG) {
                log("iccOpenLogicalChannel: subId=" + subId + " aid=" + aid + " p2=" + p2);
            }
            IccOpenLogicalChannelResponse response = (IccOpenLogicalChannelResponse) sendRequest(
                    CMD_OPEN_CHANNEL, new Pair<String, Integer>(aid, p2), subId);
            if (DBG) log("iccOpenLogicalChannel: " + response);
            return response;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean iccCloseLogicalChannel(int subId, int channel) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "iccCloseLogicalChannel");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("iccCloseLogicalChannel: subId=" + subId + " chnl=" + channel);
            if (channel < 0) {
                return false;
            }
            Boolean success = (Boolean) sendRequest(CMD_CLOSE_CHANNEL, channel, subId);
            if (DBG) log("iccCloseLogicalChannel: " + success);
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String iccTransmitApduLogicalChannel(int subId, int channel, int cla,
            int command, int p1, int p2, int p3, String data) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "iccTransmitApduLogicalChannel");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) {
                log("iccTransmitApduLogicalChannel: subId=" + subId + " chnl=" + channel
                        + " cla=" + cla + " cmd=" + command + " p1=" + p1 + " p2=" + p2 + " p3="
                        + p3 + " data=" + data);
            }

            if (channel < 0) {
                return "";
            }

            IccIoResult response = (IccIoResult) sendRequest(CMD_TRANSMIT_APDU_LOGICAL_CHANNEL,
                    new IccAPDUArgument(channel, cla, command, p1, p2, p3, data), subId);
            if (DBG) log("iccTransmitApduLogicalChannel: " + response);

            // Append the returned status code to the end of the response payload.
            String s = Integer.toHexString(
                    (response.sw1 << 8) + response.sw2 + 0x10000).substring(1);
            if (response.payload != null) {
                s = IccUtils.bytesToHexString(response.payload) + s;
            }
            return s;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String iccTransmitApduBasicChannel(int subId, String callingPackage, int cla,
            int command, int p1, int p2, int p3, String data) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "iccTransmitApduBasicChannel");
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (command == SELECT_COMMAND && p1 == SELECT_P1 && p2 == SELECT_P2 && p3 == SELECT_P3
                    && TextUtils.equals(ISDR_AID, data)) {
                // Only allows LPA to select ISD-R.
                ComponentInfo bestComponent =
                        EuiccConnector.findBestComponent(mPhone.getContext().getPackageManager());
                if (bestComponent == null
                        || !TextUtils.equals(callingPackage, bestComponent.packageName)) {
                    loge("The calling package is not allowed to select ISD-R.");
                    throw new SecurityException(
                            "The calling package is not allowed to select ISD-R.");
                }
            }

            if (DBG) {
                log("iccTransmitApduBasicChannel: subId=" + subId + " cla=" + cla + " cmd="
                        + command + " p1=" + p1 + " p2=" + p2 + " p3=" + p3 + " data=" + data);
            }

            IccIoResult response = (IccIoResult) sendRequest(CMD_TRANSMIT_APDU_BASIC_CHANNEL,
                    new IccAPDUArgument(0, cla, command, p1, p2, p3, data), subId);
            if (DBG) log("iccTransmitApduBasicChannel: " + response);

            // Append the returned status code to the end of the response payload.
            String s = Integer.toHexString(
                    (response.sw1 << 8) + response.sw2 + 0x10000).substring(1);
            if (response.payload != null) {
                s = IccUtils.bytesToHexString(response.payload) + s;
            }
            return s;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public byte[] iccExchangeSimIO(int subId, int fileID, int command, int p1, int p2, int p3,
            String filePath) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "iccExchangeSimIO");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) {
                log("Exchange SIM_IO " + subId + ":" + fileID + ":" + command + " "
                        + p1 + " " + p2 + " " + p3 + ":" + filePath);
            }

            IccIoResult response =
                    (IccIoResult) sendRequest(CMD_EXCHANGE_SIM_IO,
                            new IccAPDUArgument(-1, fileID, command, p1, p2, p3, filePath),
                            subId);

            if (DBG) {
                log("Exchange SIM_IO [R]" + response);
            }

            byte[] result = null;
            int length = 2;
            if (response.payload != null) {
                length = 2 + response.payload.length;
                result = new byte[length];
                System.arraycopy(response.payload, 0, result, 0, response.payload.length);
            } else {
                result = new byte[length];
            }

            result[length - 1] = (byte) response.sw2;
            result[length - 2] = (byte) response.sw1;
            return result;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get the forbidden PLMN List from the given app type (ex APPTYPE_USIM)
     * on a particular subscription
     */
    public String[] getForbiddenPlmns(int subId, int appType, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getForbiddenPlmns")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            if (appType != TelephonyManager.APPTYPE_USIM
                    && appType != TelephonyManager.APPTYPE_SIM) {
                loge("getForbiddenPlmnList(): App Type must be USIM or SIM");
                return null;
            }
            Object response = sendRequest(
                    CMD_GET_FORBIDDEN_PLMNS, new Integer(appType), subId);
            if (response instanceof String[]) {
                return (String[]) response;
            }
            // Response is an Exception of some kind,
            // which is signalled to the user as a NULL retval
            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String sendEnvelopeWithStatus(int subId, String content) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "sendEnvelopeWithStatus");

        final long identity = Binder.clearCallingIdentity();
        try {
            IccIoResult response = (IccIoResult) sendRequest(CMD_SEND_ENVELOPE, content, subId);
            if (response.payload == null) {
                return "";
            }

            // Append the returned status code to the end of the response payload.
            String s = Integer.toHexString(
                    (response.sw1 << 8) + response.sw2 + 0x10000).substring(1);
            s = IccUtils.bytesToHexString(response.payload) + s;
            return s;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Read one of the NV items defined in {@link com.android.internal.telephony.RadioNVItems}
     * and {@code ril_nv_items.h}. Used for device configuration by some CDMA operators.
     *
     * @param itemID the ID of the item to read
     * @return the NV item as a String, or null on error.
     */
    @Override
    public String nvReadItem(int itemID) {
        WorkSource workSource = getWorkSource(Binder.getCallingUid());
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, getDefaultSubscription(), "nvReadItem");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("nvReadItem: item " + itemID);
            String value = (String) sendRequest(CMD_NV_READ_ITEM, itemID, workSource);
            if (DBG) log("nvReadItem: item " + itemID + " is \"" + value + '"');
            return value;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Write one of the NV items defined in {@link com.android.internal.telephony.RadioNVItems}
     * and {@code ril_nv_items.h}. Used for device configuration by some CDMA operators.
     *
     * @param itemID the ID of the item to read
     * @param itemValue the value to write, as a String
     * @return true on success; false on any failure
     */
    @Override
    public boolean nvWriteItem(int itemID, String itemValue) {
        WorkSource workSource = getWorkSource(Binder.getCallingUid());
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, getDefaultSubscription(), "nvWriteItem");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("nvWriteItem: item " + itemID + " value \"" + itemValue + '"');
            Boolean success = (Boolean) sendRequest(CMD_NV_WRITE_ITEM,
                    new Pair<Integer, String>(itemID, itemValue), workSource);
            if (DBG) log("nvWriteItem: item " + itemID + ' ' + (success ? "ok" : "fail"));
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Update the CDMA Preferred Roaming List (PRL) in the radio NV storage.
     * Used for device configuration by some CDMA operators.
     *
     * @param preferredRoamingList byte array containing the new PRL
     * @return true on success; false on any failure
     */
    @Override
    public boolean nvWriteCdmaPrl(byte[] preferredRoamingList) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, getDefaultSubscription(), "nvWriteCdmaPrl");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("nvWriteCdmaPrl: value: " + HexDump.toHexString(preferredRoamingList));
            Boolean success = (Boolean) sendRequest(CMD_NV_WRITE_CDMA_PRL, preferredRoamingList);
            if (DBG) log("nvWriteCdmaPrl: " + (success ? "ok" : "fail"));
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Perform the specified type of NV config reset.
     * Used for device configuration by some CDMA operators.
     *
     * @param resetType the type of reset to perform (1 == factory reset; 2 == NV-only reset)
     * @return true on success; false on any failure
     */
    @Override
    public boolean nvResetConfig(int resetType) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, getDefaultSubscription(), "nvResetConfig");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("nvResetConfig: type " + resetType);
            Boolean success = (Boolean) sendRequest(CMD_NV_RESET_CONFIG, resetType);
            if (DBG) log("nvResetConfig: type " + resetType + ' ' + (success ? "ok" : "fail"));
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public String[] getPcscfAddress(String apnType, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, mPhone.getSubId(), callingPackage, "getPcscfAddress")) {
            return new String[0];
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return mPhone.getPcscfAddress(apnType);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Enables IMS for the framework. This will trigger IMS registration and ImsFeature capability
     * status updates, if not already enabled.
     */
    public void enableIms(int slotId) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            PhoneFactory.getImsResolver().enableIms(slotId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Disables IMS for the framework. This will trigger IMS de-registration and trigger ImsFeature
     * status updates to disabled.
     */
    public void disableIms(int slotId) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            PhoneFactory.getImsResolver().disableIms(slotId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the {@link IImsMmTelFeature} that corresponds to the given slot Id for the MMTel
     * feature or {@link null} if the service is not available. If the feature is available, the
     * {@link IImsServiceFeatureCallback} callback is registered as a listener for feature updates.
     */
    public IImsMmTelFeature getMmTelFeatureAndListen(int slotId,
            IImsServiceFeatureCallback callback) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().getMmTelFeatureAndListen(slotId, callback);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the {@link IImsRcsFeature} that corresponds to the given slot Id for the RCS
     * feature during emergency calling or {@link null} if the service is not available. If the
     * feature is available, the {@link IImsServiceFeatureCallback} callback is registered as a
     * listener for feature updates.
     */
    public IImsRcsFeature getRcsFeatureAndListen(int slotId, IImsServiceFeatureCallback callback) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().getRcsFeatureAndListen(slotId, callback);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the {@link IImsRegistration} structure associated with the slotId and feature
     * specified.
     */
    public IImsRegistration getImsRegistration(int slotId, int feature) throws RemoteException {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().getImsRegistration(slotId, feature);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the {@link IImsConfig} structure associated with the slotId and feature
     * specified.
     */
    public IImsConfig getImsConfig(int slotId, int feature) throws RemoteException {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().getImsConfig(slotId, feature);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Sets the ImsService Package Name that Telephony will bind to.
     *
     * @param slotId the slot ID that the ImsService should bind for.
     * @param isCarrierImsService true if the ImsService is the carrier override, false if the
     *         ImsService is the device default ImsService.
     * @param packageName The package name of the application that contains the ImsService to bind
     *         to.
     * @return true if setting the ImsService to bind to succeeded, false if it did not.
     * @hide
     */
    public boolean setImsService(int slotId, boolean isCarrierImsService, String packageName) {
        int[] subIds = SubscriptionManager.getSubId(slotId);
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp,
                (subIds != null ? subIds[0] : SubscriptionManager.INVALID_SUBSCRIPTION_ID),
                "setImsService");

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().overrideImsServiceConfiguration(slotId,
                    isCarrierImsService, packageName);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Return the ImsService configuration.
     *
     * @param slotId The slot that the ImsService is associated with.
     * @param isCarrierImsService true, if the ImsService is a carrier override, false if it is
     *         the device default.
     * @return the package name of the ImsService configuration.
     */
    public String getImsService(int slotId, boolean isCarrierImsService) {
        int[] subIds = SubscriptionManager.getSubId(slotId);
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp,
                (subIds != null ? subIds[0] : SubscriptionManager.INVALID_SUBSCRIPTION_ID),
                "getImsService");

        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneFactory.getImsResolver().getImsServiceConfiguration(slotId,
                    isCarrierImsService);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public void setImsRegistrationState(boolean registered) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            mPhone.setImsRegistrationState(registered);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Set the network selection mode to automatic.
     *
     */
    @Override
    public void setNetworkSelectionModeAutomatic(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setNetworkSelectionModeAutomatic");

        if (!isActiveSubscription(subId)) {
            return;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("setNetworkSelectionModeAutomatic: subId " + subId);
            sendRequest(CMD_SET_NETWORK_SELECTION_MODE_AUTOMATIC, null, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

   /**
     * Ask the radio to connect to the input network and change selection mode to manual.
     *
     * @param subId the id of the subscription.
     * @param operatorInfo the operator information, included the PLMN, long name and short name of
     * the operator to attach to.
     * @param persistSelection whether the selection will persist until reboot. If true, only allows
     * attaching to the selected PLMN until reboot; otherwise, attach to the chosen PLMN and resume
     * normal network selection next time.
     * @return {@code true} on success; {@code true} on any failure.
     */
    @Override
    public boolean setNetworkSelectionModeManual(
            int subId, OperatorInfo operatorInfo, boolean persistSelection) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setNetworkSelectionModeManual");

        if (!isActiveSubscription(subId)) {
            return false;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            ManualNetworkSelectionArgument arg = new ManualNetworkSelectionArgument(operatorInfo,
                    persistSelection);
            if (DBG) {
                log("setNetworkSelectionModeManual: subId: " + subId
                        + " operator: " + operatorInfo);
            }
            return (Boolean) sendRequest(CMD_SET_NETWORK_SELECTION_MODE_MANUAL, arg, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Scans for available networks.
     */
    @Override
    public CellNetworkScanResult getCellNetworkScanResults(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "getCellNetworkScanResults");

        long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("getCellNetworkScanResults: subId " + subId);
            return (CellNetworkScanResult) sendRequest(
                    CMD_PERFORM_NETWORK_SCAN, null, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Starts a new network scan and returns the id of this scan.
     *
     * @param subId id of the subscription
     * @param request contains the radio access networks with bands/channels to scan
     * @param messenger callback messenger for scan results or errors
     * @param binder for the purpose of auto clean when the user thread crashes
     * @return the id of the requested scan which can be used to stop the scan.
     */
    @Override
    public int requestNetworkScan(int subId, NetworkScanRequest request, Messenger messenger,
            IBinder binder) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "requestNetworkScan");

        final long identity = Binder.clearCallingIdentity();
        try {
            return mNetworkScanRequestTracker.startNetworkScan(
                    request, messenger, binder, getPhone(subId));
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Stops an existing network scan with the given scanId.
     *
     * @param subId id of the subscription
     * @param scanId id of the scan that needs to be stopped
     */
    @Override
    public void stopNetworkScan(int subId, int scanId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "stopNetworkScan");

        final long identity = Binder.clearCallingIdentity();
        try {
            mNetworkScanRequestTracker.stopNetworkScan(scanId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get the calculated preferred network type.
     * Used for debugging incorrect network type.
     *
     * @return the preferred network type, defined in RILConstants.java.
     */
    @Override
    public int getCalculatedPreferredNetworkType(String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, mPhone.getSubId(), callingPackage, "getCalculatedPreferredNetworkType")) {
            return RILConstants.PREFERRED_NETWORK_MODE;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            // FIXME: need to get SubId from somewhere.
            return PhoneFactory.calculatePreferredNetworkType(mPhone.getContext(), 0);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get the preferred network type.
     * Used for device configuration by some CDMA operators.
     *
     * @return the preferred network type, defined in RILConstants.java.
     */
    @Override
    public int getPreferredNetworkType(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "getPreferredNetworkType");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("getPreferredNetworkType");
            int[] result = (int[]) sendRequest(CMD_GET_PREFERRED_NETWORK_TYPE, null, subId);
            int networkType = (result != null ? result[0] : -1);
            if (DBG) log("getPreferredNetworkType: " + networkType);
            return networkType;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Set the preferred network type.
     * Used for device configuration by some CDMA operators.
     *
     * @param networkType the preferred network type, defined in RILConstants.java.
     * @return true on success; false on any failure.
     */
    @Override
    public boolean setPreferredNetworkType(int subId, int networkType) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setPreferredNetworkType");

        final long identity = Binder.clearCallingIdentity();
        try {
            if (DBG) log("setPreferredNetworkType: subId " + subId + " type " + networkType);
            Boolean success = (Boolean) sendRequest(
                    CMD_SET_PREFERRED_NETWORK_TYPE, networkType, subId);
            if (DBG) log("setPreferredNetworkType: " + (success ? "ok" : "fail"));
            if (success) {
                Settings.Global.putInt(mPhone.getContext().getContentResolver(),
                        Settings.Global.PREFERRED_NETWORK_MODE + subId, networkType);
            }
            return success;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Check TETHER_DUN_REQUIRED and TETHER_DUN_APN settings, net.tethering.noprovisioning
     * SystemProperty, and config_tether_apndata to decide whether DUN APN is required for
     * tethering.
     *
     * @return 0: Not required. 1: required. 2: Not set.
     * @hide
     */
    @Override
    public int getTetherApnRequired() {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            int dunRequired = Settings.Global.getInt(mPhone.getContext().getContentResolver(),
                    Settings.Global.TETHER_DUN_REQUIRED, 2);
            // If not set, check net.tethering.noprovisioning, TETHER_DUN_APN setting and
            // config_tether_apndata.
            if (dunRequired == 2 && mPhone.hasMatchedTetherApnSetting()) {
                dunRequired = 1;
            }
            return dunRequired;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Set mobile data enabled
     * Used by the user through settings etc to turn on/off mobile data
     *
     * @param enable {@code true} turn turn data on, else {@code false}
     */
    @Override
    public void setUserDataEnabled(int subId, boolean enable) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setUserDataEnabled");

        final long identity = Binder.clearCallingIdentity();
        try {
            int phoneId = mSubscriptionController.getPhoneId(subId);
            if (DBG) log("setUserDataEnabled: subId=" + subId + " phoneId=" + phoneId);
            Phone phone = PhoneFactory.getPhone(phoneId);
            if (phone != null) {
                if (DBG) log("setUserDataEnabled: subId=" + subId + " enable=" + enable);
                phone.setUserDataEnabled(enable);
            } else {
                loge("setUserDataEnabled: no phone for subId=" + subId);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get the user enabled state of Mobile Data.
     *
     * TODO: remove and use isUserDataEnabled.
     * This can't be removed now because some vendor codes
     * calls through ITelephony directly while they should
     * use TelephonyManager.
     *
     * @return true on enabled
     */
    @Override
    public boolean getDataEnabled(int subId) {
        return isUserDataEnabled(subId);
    }

    /**
     * Get whether mobile data is enabled per user setting.
     *
     * There are other factors deciding whether mobile data is actually enabled, but they are
     * not considered here. See {@link #isDataEnabled(int)} for more details.
     *
     * Accepts either ACCESS_NETWORK_STATE, MODIFY_PHONE_STATE or carrier privileges.
     *
     * @return {@code true} if data is enabled else {@code false}
     */
    @Override
    public boolean isUserDataEnabled(int subId) {
        try {
            mApp.enforceCallingOrSelfPermission(android.Manifest.permission.ACCESS_NETWORK_STATE,
                    null);
        } catch (Exception e) {
            TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                    mApp, subId, "isUserDataEnabled");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            int phoneId = mSubscriptionController.getPhoneId(subId);
            if (DBG) log("isUserDataEnabled: subId=" + subId + " phoneId=" + phoneId);
            Phone phone = PhoneFactory.getPhone(phoneId);
            if (phone != null) {
                boolean retVal = phone.isUserDataEnabled();
                if (DBG) log("isUserDataEnabled: subId=" + subId + " retVal=" + retVal);
                return retVal;
            } else {
                if (DBG) loge("isUserDataEnabled: no phone subId=" + subId + " retVal=false");
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get whether mobile data is enabled.
     *
     * Comparable to {@link #isUserDataEnabled(int)}, this considers all factors deciding
     * whether mobile data is actually enabled.
     *
     * Accepts either ACCESS_NETWORK_STATE, MODIFY_PHONE_STATE or carrier privileges.
     *
     * @return {@code true} if data is enabled else {@code false}
     */
    @Override
    public boolean isDataEnabled(int subId) {
        try {
            mApp.enforceCallingOrSelfPermission(android.Manifest.permission.ACCESS_NETWORK_STATE,
                    null);
        } catch (Exception e) {
            TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                    mApp, subId, "isDataEnabled");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            int phoneId = mSubscriptionController.getPhoneId(subId);
            if (DBG) log("isDataEnabled: subId=" + subId + " phoneId=" + phoneId);
            Phone phone = PhoneFactory.getPhone(phoneId);
            if (phone != null) {
                boolean retVal = phone.isDataEnabled();
                if (DBG) log("isDataEnabled: subId=" + subId + " retVal=" + retVal);
                return retVal;
            } else {
                if (DBG) loge("isDataEnabled: no phone subId=" + subId + " retVal=false");
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getCarrierPrivilegeStatus(int subId) {
        final Phone phone = getPhone(subId);
        if (phone == null) {
            loge("getCarrierPrivilegeStatus: Invalid subId");
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_NO_ACCESS;
        }
        UiccCard card = UiccController.getInstance().getUiccCard(phone.getPhoneId());
        if (card == null) {
            loge("getCarrierPrivilegeStatus: No UICC");
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_RULES_NOT_LOADED;
        }
        return card.getCarrierPrivilegeStatusForCurrentTransaction(
                phone.getContext().getPackageManager());
    }

    @Override
    public int getCarrierPrivilegeStatusForUid(int subId, int uid) {
        final Phone phone = getPhone(subId);
        if (phone == null) {
            loge("getCarrierPrivilegeStatus: Invalid subId");
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_NO_ACCESS;
        }
        UiccProfile profile =
                UiccController.getInstance().getUiccProfileForPhone(phone.getPhoneId());
        if (profile == null) {
            loge("getCarrierPrivilegeStatus: No UICC");
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_RULES_NOT_LOADED;
        }
        return profile.getCarrierPrivilegeStatusForUid(phone.getContext().getPackageManager(), uid);
    }

    @Override
    public int checkCarrierPrivilegesForPackage(String pkgName) {
        if (TextUtils.isEmpty(pkgName))
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_NO_ACCESS;
        UiccCard card = UiccController.getInstance().getUiccCard(mPhone.getPhoneId());
        if (card == null) {
            loge("checkCarrierPrivilegesForPackage: No UICC");
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_RULES_NOT_LOADED;
        }
        return card.getCarrierPrivilegeStatus(mPhone.getContext().getPackageManager(), pkgName);
    }

    @Override
    public int checkCarrierPrivilegesForPackageAnyPhone(String pkgName) {
        if (TextUtils.isEmpty(pkgName))
            return TelephonyManager.CARRIER_PRIVILEGE_STATUS_NO_ACCESS;
        int result = TelephonyManager.CARRIER_PRIVILEGE_STATUS_RULES_NOT_LOADED;
        for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) {
            UiccCard card = UiccController.getInstance().getUiccCard(i);
            if (card == null) {
              // No UICC in that slot.
              continue;
            }

            result = card.getCarrierPrivilegeStatus(
                mPhone.getContext().getPackageManager(), pkgName);
            if (result == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) {
                break;
            }
        }

        return result;
    }

    @Override
    public List<String> getCarrierPackageNamesForIntentAndPhone(Intent intent, int phoneId) {
        if (!SubscriptionManager.isValidPhoneId(phoneId)) {
            loge("phoneId " + phoneId + " is not valid.");
            return null;
        }
        UiccCard card = UiccController.getInstance().getUiccCard(phoneId);
        if (card == null) {
            loge("getCarrierPackageNamesForIntent: No UICC");
            return null ;
        }
        return card.getCarrierPackageNamesForIntent(
                mPhone.getContext().getPackageManager(), intent);
    }

    @Override
    public List<String> getPackagesWithCarrierPrivileges() {
        PackageManager pm = mPhone.getContext().getPackageManager();
        List<String> privilegedPackages = new ArrayList<>();
        List<PackageInfo> packages = null;
        for (int i = 0; i < TelephonyManager.getDefault().getPhoneCount(); i++) {
            UiccCard card = UiccController.getInstance().getUiccCard(i);
            if (card == null) {
                // No UICC in that slot.
                continue;
            }
            if (card.hasCarrierPrivilegeRules()) {
                if (packages == null) {
                    // Only check packages in user 0 for now
                    packages = pm.getInstalledPackagesAsUser(
                            PackageManager.MATCH_DISABLED_COMPONENTS
                            | PackageManager.MATCH_DISABLED_UNTIL_USED_COMPONENTS
                            | PackageManager.GET_SIGNATURES, UserHandle.USER_SYSTEM);
                }
                for (int p = packages.size() - 1; p >= 0; p--) {
                    PackageInfo pkgInfo = packages.get(p);
                    if (pkgInfo != null && pkgInfo.packageName != null
                            && card.getCarrierPrivilegeStatus(pkgInfo)
                                == TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) {
                        privilegedPackages.add(pkgInfo.packageName);
                    }
                }
            }
        }
        return privilegedPackages;
    }

    private String getIccId(int subId) {
        final Phone phone = getPhone(subId);
        UiccCard card = phone == null ? null : phone.getUiccCard();
        if (card == null) {
            loge("getIccId: No UICC");
            return null;
        }
        String iccId = card.getIccId();
        if (TextUtils.isEmpty(iccId)) {
            loge("getIccId: ICC ID is null or empty.");
            return null;
        }
        return iccId;
    }

    @Override
    public boolean setLine1NumberForDisplayForSubscriber(int subId, String alphaTag,
            String number) {
        TelephonyPermissions.enforceCallingOrSelfCarrierPrivilege(
                subId, "setLine1NumberForDisplayForSubscriber");

        final long identity = Binder.clearCallingIdentity();
        try {
            final String iccId = getIccId(subId);
            final Phone phone = getPhone(subId);
            if (phone == null) {
                return false;
            }
            final String subscriberId = phone.getSubscriberId();

            if (DBG_MERGE) {
                Slog.d(LOG_TAG, "Setting line number for ICC=" + iccId + ", subscriberId="
                        + subscriberId + " to " + number);
            }

            if (TextUtils.isEmpty(iccId)) {
                return false;
            }

            final SharedPreferences.Editor editor = mTelephonySharedPreferences.edit();

            final String alphaTagPrefKey = PREF_CARRIERS_ALPHATAG_PREFIX + iccId;
            if (alphaTag == null) {
                editor.remove(alphaTagPrefKey);
            } else {
                editor.putString(alphaTagPrefKey, alphaTag);
            }

            // Record both the line number and IMSI for this ICCID, since we need to
            // track all merged IMSIs based on line number
            final String numberPrefKey = PREF_CARRIERS_NUMBER_PREFIX + iccId;
            final String subscriberPrefKey = PREF_CARRIERS_SUBSCRIBER_PREFIX + iccId;
            if (number == null) {
                editor.remove(numberPrefKey);
                editor.remove(subscriberPrefKey);
            } else {
                editor.putString(numberPrefKey, number);
                editor.putString(subscriberPrefKey, subscriberId);
            }

            editor.commit();
            return true;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getLine1NumberForDisplay(int subId, String callingPackage) {
        // This is open to apps with WRITE_SMS.
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneNumber(
                mApp, subId, callingPackage, "getLine1NumberForDisplay")) {
            if (DBG_MERGE) log("getLine1NumberForDisplay returning null due to permission");
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            String iccId = getIccId(subId);
            if (iccId != null) {
                String numberPrefKey = PREF_CARRIERS_NUMBER_PREFIX + iccId;
                if (DBG_MERGE) {
                    log("getLine1NumberForDisplay returning "
                            + mTelephonySharedPreferences.getString(numberPrefKey, null));
                }
                return mTelephonySharedPreferences.getString(numberPrefKey, null);
            }
            if (DBG_MERGE) log("getLine1NumberForDisplay returning null as iccId is null");
            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getLine1AlphaTagForDisplay(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getLine1AlphaTagForDisplay")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            String iccId = getIccId(subId);
            if (iccId != null) {
                String alphaTagPrefKey = PREF_CARRIERS_ALPHATAG_PREFIX + iccId;
                return mTelephonySharedPreferences.getString(alphaTagPrefKey, null);
            }
            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String[] getMergedSubscriberIds(String callingPackage) {
        // This API isn't public, so no need to provide a valid subscription ID - we're not worried
        // about carrier-privileged callers not having access.
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, SubscriptionManager.INVALID_SUBSCRIPTION_ID, callingPackage,
                "getMergedSubscriberIds")) {
            return null;
        }

        final long identity  = Binder.clearCallingIdentity();
        try {
            final Context context = mPhone.getContext();
            final TelephonyManager tele = TelephonyManager.from(context);
            final SubscriptionManager sub = SubscriptionManager.from(context);

            // Figure out what subscribers are currently active
            final ArraySet<String> activeSubscriberIds = new ArraySet<>();
            // Clear calling identity, when calling TelephonyManager, because callerUid must be
            // the process, where TelephonyManager was instantiated.
            // Otherwise AppOps check will fail.

            final int[] subIds = sub.getActiveSubscriptionIdList();
            for (int subId : subIds) {
                activeSubscriberIds.add(tele.getSubscriberId(subId));
            }

            // First pass, find a number override for an active subscriber
            String mergeNumber = null;
            final Map<String, ?> prefs = mTelephonySharedPreferences.getAll();
            for (String key : prefs.keySet()) {
                if (key.startsWith(PREF_CARRIERS_SUBSCRIBER_PREFIX)) {
                    final String subscriberId = (String) prefs.get(key);
                    if (activeSubscriberIds.contains(subscriberId)) {
                        final String iccId = key.substring(
                                PREF_CARRIERS_SUBSCRIBER_PREFIX.length());
                        final String numberKey = PREF_CARRIERS_NUMBER_PREFIX + iccId;
                        mergeNumber = (String) prefs.get(numberKey);
                        if (DBG_MERGE) {
                            Slog.d(LOG_TAG, "Found line number " + mergeNumber
                                    + " for active subscriber " + subscriberId);
                        }
                        if (!TextUtils.isEmpty(mergeNumber)) {
                            break;
                        }
                    }
                }
            }

            // Shortcut when no active merged subscribers
            if (TextUtils.isEmpty(mergeNumber)) {
                return null;
            }

            // Second pass, find all subscribers under that line override
            final ArraySet<String> result = new ArraySet<>();
            for (String key : prefs.keySet()) {
                if (key.startsWith(PREF_CARRIERS_NUMBER_PREFIX)) {
                    final String number = (String) prefs.get(key);
                    if (mergeNumber.equals(number)) {
                        final String iccId = key.substring(PREF_CARRIERS_NUMBER_PREFIX.length());
                        final String subscriberKey = PREF_CARRIERS_SUBSCRIBER_PREFIX + iccId;
                        final String subscriberId = (String) prefs.get(subscriberKey);
                        if (!TextUtils.isEmpty(subscriberId)) {
                            result.add(subscriberId);
                        }
                    }
                }
            }

            final String[] resultArray = result.toArray(new String[result.size()]);
            Arrays.sort(resultArray);
            if (DBG_MERGE) {
                Slog.d(LOG_TAG,
                        "Found subscribers " + Arrays.toString(resultArray) + " after merge");
            }
            return resultArray;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean setOperatorBrandOverride(int subId, String brand) {
        TelephonyPermissions.enforceCallingOrSelfCarrierPrivilege(
                subId, "setOperatorBrandOverride");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            return phone == null ? false : phone.setOperatorBrandOverride(brand);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean setRoamingOverride(int subId, List<String> gsmRoamingList,
            List<String> gsmNonRoamingList, List<String> cdmaRoamingList,
            List<String> cdmaNonRoamingList) {
        TelephonyPermissions.enforceCallingOrSelfCarrierPrivilege(subId, "setRoamingOverride");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                return false;
            }
            return phone.setRoamingOverride(gsmRoamingList, gsmNonRoamingList, cdmaRoamingList,
                    cdmaNonRoamingList);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    @Deprecated
    public int invokeOemRilRequestRaw(byte[] oemReq, byte[] oemResp) {
        enforceModifyPermission();

        int returnValue = 0;
        try {
            AsyncResult result = (AsyncResult) sendRequest(CMD_INVOKE_OEM_RIL_REQUEST_RAW, oemReq);
            if(result.exception == null) {
                if (result.result != null) {
                    byte[] responseData = (byte[])(result.result);
                    if(responseData.length > oemResp.length) {
                        Log.w(LOG_TAG, "Buffer to copy response too small: Response length is " +
                                responseData.length +  "bytes. Buffer Size is " +
                                oemResp.length + "bytes.");
                    }
                    System.arraycopy(responseData, 0, oemResp, 0, responseData.length);
                    returnValue = responseData.length;
                }
            } else {
                CommandException ex = (CommandException) result.exception;
                returnValue = ex.getCommandError().ordinal();
                if(returnValue > 0) returnValue *= -1;
            }
        } catch (RuntimeException e) {
            Log.w(LOG_TAG, "sendOemRilRequestRaw: Runtime Exception");
            returnValue = (CommandException.Error.GENERIC_FAILURE.ordinal());
            if(returnValue > 0) returnValue *= -1;
        }

        return returnValue;
    }

    @Override
    public void setRadioCapability(RadioAccessFamily[] rafs) {
        try {
            ProxyController.getInstance().setRadioCapability(rafs);
        } catch (RuntimeException e) {
            Log.w(LOG_TAG, "setRadioCapability: Runtime Exception");
        }
    }

    @Override
    public int getRadioAccessFamily(int phoneId, String callingPackage) {
        Phone phone = PhoneFactory.getPhone(phoneId);
        if (phone == null) {
            return RadioAccessFamily.RAF_UNKNOWN;
        }
        int subId = phone.getSubId();
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getRadioAccessFamily")) {
            return RadioAccessFamily.RAF_UNKNOWN;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return ProxyController.getInstance().getRadioAccessFamily(phoneId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void enableVideoCalling(boolean enable) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            ImsManager.getInstance(mPhone.getContext(), mPhone.getPhoneId()).setVtSetting(enable);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isVideoCallingEnabled(String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, mPhone.getSubId(), callingPackage, "isVideoCallingEnabled")) {
            return false;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            // Check the user preference and the  system-level IMS setting. Even if the user has
            // enabled video calling, if IMS is disabled we aren't able to support video calling.
            // In the long run, we may instead need to check if there exists a connection service
            // which can support video calling.
            ImsManager imsManager =
                    ImsManager.getInstance(mPhone.getContext(), mPhone.getPhoneId());
            return imsManager.isVtEnabledByPlatform()
                    && imsManager.isEnhanced4gLteModeSettingEnabledByUser()
                    && imsManager.isVtEnabledByUser();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean canChangeDtmfToneLength(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "isVideoCallingEnabled")) {
            return false;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            CarrierConfigManager configManager =
                    (CarrierConfigManager) mApp.getSystemService(Context.CARRIER_CONFIG_SERVICE);
            return configManager.getConfigForSubId(mPhone.getSubId())
                    .getBoolean(CarrierConfigManager.KEY_DTMF_TYPE_ENABLED_BOOL);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isWorldPhone(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "isVideoCallingEnabled")) {
            return false;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            CarrierConfigManager configManager =
                    (CarrierConfigManager) mApp.getSystemService(Context.CARRIER_CONFIG_SERVICE);
            return configManager.getConfigForSubId(mPhone.getSubId())
                    .getBoolean(CarrierConfigManager.KEY_WORLD_PHONE_BOOL);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isTtyModeSupported() {
        TelecomManager telecomManager = TelecomManager.from(mPhone.getContext());
        return telecomManager.isTtySupported();
    }

    @Override
    public boolean isHearingAidCompatibilitySupported() {
        final long identity = Binder.clearCallingIdentity();
        try {
            return mPhone.getContext().getResources().getBoolean(R.bool.hac_enabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean isRttSupported() {
        final long identity = Binder.clearCallingIdentity();
        try {
            boolean isCarrierSupported = mApp.getCarrierConfigForSubId(
                    mPhone.getSubId()).getBoolean(
                    CarrierConfigManager.KEY_RTT_SUPPORTED_BOOL);
            boolean isDeviceSupported =
                    mPhone.getContext().getResources().getBoolean(R.bool.config_support_rtt);
            return isCarrierSupported && isDeviceSupported;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    public boolean isRttEnabled() {
        final long identity = Binder.clearCallingIdentity();
        try {
            return isRttSupported() && Settings.Secure.getInt(
                    mPhone.getContext().getContentResolver(),
                    Settings.Secure.RTT_CALLING_MODE, 0) != 0;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the unique device ID of phone, for example, the IMEI for
     * GSM and the MEID for CDMA phones. Return null if device ID is not available.
     *
     * <p>Requires Permission:
     *   {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}
     */
    @Override
    public String getDeviceId(String callingPackage) {
        final Phone phone = PhoneFactory.getPhone(0);
        if (phone == null) {
            return null;
        }
        int subId = phone.getSubId();
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getDeviceId")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return phone.getDeviceId();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * {@hide}
     * Returns the IMS Registration Status on a particular subid
     *
     * @param subId
     */
    public boolean isImsRegistered(int subId) {
        Phone phone = getPhone(subId);
        if (phone != null) {
            return phone.isImsRegistered();
        } else {
            return false;
        }
    }

    @Override
    public int getSubIdForPhoneAccount(PhoneAccount phoneAccount) {
        final long identity = Binder.clearCallingIdentity();
        try {
            return PhoneUtils.getSubIdForPhoneAccount(phoneAccount);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * @return the VoWiFi calling availability.
     */
    public boolean isWifiCallingAvailable(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.isWifiCallingEnabled();
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * @return the VT calling availability.
     */
    public boolean isVideoTelephonyAvailable(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.isVideoEnabled();
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * @return the IMS registration technology for the MMTEL feature. Valid return values are
     * defined in {@link ImsRegistrationImplBase}.
     */
    public @ImsRegistrationImplBase.ImsRegistrationTech int getImsRegTechnologyForMmTel(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getImsRegistrationTech();
            } else {
                return ImsRegistrationImplBase.REGISTRATION_TECH_NONE;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void factoryReset(int subId) {
        enforceConnectivityInternalPermission();
        if (mUserManager.hasUserRestriction(UserManager.DISALLOW_NETWORK_RESET)) {
            return;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            if (SubscriptionManager.isUsableSubIdValue(subId) && !mUserManager.hasUserRestriction(
                    UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
                setUserDataEnabled(subId, getDefaultDataEnabled());
                setNetworkSelectionModeAutomatic(subId);
                setPreferredNetworkType(subId, getDefaultNetworkType(subId));
                mPhone.setDataRoamingEnabled(getDefaultDataRoamingEnabled(subId));
                CarrierInfoManager.deleteAllCarrierKeysForImsiEncryption(mPhone.getContext());
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public String getLocaleFromDefaultSim() {
        final long identity = Binder.clearCallingIdentity();
        try {
            // We query all subscriptions instead of just the active ones, because
            // this might be called early on in the provisioning flow when the
            // subscriptions potentially aren't active yet.
            final List<SubscriptionInfo> slist = getAllSubscriptionInfoList();
            if (slist == null || slist.isEmpty()) {
                return null;
            }

            // This function may be called very early, say, from the setup wizard, at
            // which point we won't have a default subscription set. If that's the case
            // we just choose the first, which will be valid in "most cases".
            final int defaultSubId = getDefaultSubscription();
            SubscriptionInfo info = null;
            if (defaultSubId == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
                info = slist.get(0);
            } else {
                for (SubscriptionInfo item : slist) {
                    if (item.getSubscriptionId() == defaultSubId) {
                        info = item;
                        break;
                    }
                }

                if (info == null) {
                    return null;
                }
            }

            // Try and fetch the locale from the carrier properties or from the SIM language
            // preferences (EF-PL and EF-LI)...
            final int mcc = info.getMcc();
            final Phone defaultPhone = getPhone(info.getSubscriptionId());
            String simLanguage = null;
            if (defaultPhone != null) {
                final Locale localeFromDefaultSim = defaultPhone.getLocaleFromSimAndCarrierPrefs();
                if (localeFromDefaultSim != null) {
                    if (!localeFromDefaultSim.getCountry().isEmpty()) {
                        if (DBG) log("Using locale from default SIM:" + localeFromDefaultSim);
                        return localeFromDefaultSim.toLanguageTag();
                    } else {
                        simLanguage = localeFromDefaultSim.getLanguage();
                    }
                }
            }

            // The SIM language preferences only store a language (e.g. fr = French), not an
            // exact locale (e.g. fr_FR = French/France). So, if the locale returned from
            // the SIM and carrier preferences does not include a country we add the country
            // determined from the SIM MCC to provide an exact locale.
            final Locale mccLocale = MccTable.getLocaleFromMcc(mPhone.getContext(), mcc,
                    simLanguage);
            if (mccLocale != null) {
                if (DBG) log("No locale from default SIM, using mcc locale:" + mccLocale);
                return mccLocale.toLanguageTag();
            }

            if (DBG) log("No locale found - returning null");
            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private List<SubscriptionInfo> getAllSubscriptionInfoList() {
        return mSubscriptionController.getAllSubInfoList(
                mPhone.getContext().getOpPackageName());
    }

    /**
     * NOTE: this method assumes permission checks are done and caller identity has been cleared.
     */
    private List<SubscriptionInfo> getActiveSubscriptionInfoListPrivileged() {
        return mSubscriptionController.getActiveSubscriptionInfoList(
                mPhone.getContext().getOpPackageName());
    }

    private final ModemActivityInfo mLastModemActivityInfo =
            new ModemActivityInfo(0, 0, 0, new int[0], 0, 0);

    /**
     * Responds to the ResultReceiver with the {@link android.telephony.ModemActivityInfo} object
     * representing the state of the modem.
     *
     * NOTE: The underlying implementation clears the modem state, so there should only ever be one
     * caller to it. Everyone should call this class to get cumulative data.
     * @hide
     */
    @Override
    public void requestModemActivityInfo(ResultReceiver result) {
        enforceModifyPermission();
        WorkSource workSource = getWorkSource(Binder.getCallingUid());

        final long identity = Binder.clearCallingIdentity();
        try {
            ModemActivityInfo ret = null;
            synchronized (mLastModemActivityInfo) {
                ModemActivityInfo info = (ModemActivityInfo) sendRequest(
                        CMD_GET_MODEM_ACTIVITY_INFO,
                        null, workSource);
                if (isModemActivityInfoValid(info)) {
                    int[] mergedTxTimeMs = new int[ModemActivityInfo.TX_POWER_LEVELS];
                    for (int i = 0; i < mergedTxTimeMs.length; i++) {
                        mergedTxTimeMs[i] =
                                info.getTxTimeMillis()[i]
                                        + mLastModemActivityInfo.getTxTimeMillis()[i];
                    }
                    mLastModemActivityInfo.setTimestamp(info.getTimestamp());
                    mLastModemActivityInfo.setSleepTimeMillis(
                            info.getSleepTimeMillis()
                                    + mLastModemActivityInfo.getSleepTimeMillis());
                    mLastModemActivityInfo.setIdleTimeMillis(
                            info.getIdleTimeMillis() + mLastModemActivityInfo.getIdleTimeMillis());
                    mLastModemActivityInfo.setTxTimeMillis(mergedTxTimeMs);
                    mLastModemActivityInfo.setRxTimeMillis(
                            info.getRxTimeMillis() + mLastModemActivityInfo.getRxTimeMillis());
                    mLastModemActivityInfo.setEnergyUsed(
                            info.getEnergyUsed() + mLastModemActivityInfo.getEnergyUsed());
                }
                ret = new ModemActivityInfo(mLastModemActivityInfo.getTimestamp(),
                        mLastModemActivityInfo.getSleepTimeMillis(),
                        mLastModemActivityInfo.getIdleTimeMillis(),
                        mLastModemActivityInfo.getTxTimeMillis(),
                        mLastModemActivityInfo.getRxTimeMillis(),
                        mLastModemActivityInfo.getEnergyUsed());
            }
            Bundle bundle = new Bundle();
            bundle.putParcelable(TelephonyManager.MODEM_ACTIVITY_RESULT_KEY, ret);
            result.send(0, bundle);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    // Checks that ModemActivityInfo is valid. Sleep time, Idle time, Rx time and Tx time should be
    // less than total activity duration.
    private boolean isModemActivityInfoValid(ModemActivityInfo info) {
        if (info == null) {
            return false;
        }
        int activityDurationMs =
            (int) (info.getTimestamp() - mLastModemActivityInfo.getTimestamp());
        int totalTxTimeMs = 0;
        for (int i = 0; i < info.getTxTimeMillis().length; i++) {
            totalTxTimeMs += info.getTxTimeMillis()[i];
        }
        return (info.isValid()
            && (info.getSleepTimeMillis() <= activityDurationMs)
            && (info.getIdleTimeMillis() <= activityDurationMs)
            && (info.getRxTimeMillis() <= activityDurationMs)
            && (totalTxTimeMs <= activityDurationMs));
    }

    /**
     * {@hide}
     * Returns the service state information on specified subscription.
     */
    @Override
    public ServiceState getServiceStateForSubscriber(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getServiceStateForSubscriber")) {
            return null;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                return null;
            }

            return phone.getServiceState();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns the URI for the per-account voicemail ringtone set in Phone settings.
     *
     * @param accountHandle The handle for the {@link PhoneAccount} for which to retrieve the
     * voicemail ringtone.
     * @return The URI for the ringtone to play when receiving a voicemail from a specific
     * PhoneAccount.
     */
    @Override
    public Uri getVoicemailRingtoneUri(PhoneAccountHandle accountHandle) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = PhoneUtils.getPhoneForPhoneAccountHandle(accountHandle);
            if (phone == null) {
                phone = mPhone;
            }

            return VoicemailNotificationSettingsUtil.getRingtoneUri(phone.getContext());
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Sets the per-account voicemail ringtone.
     *
     * <p>Requires that the calling app is the default dialer, or has carrier privileges, or
     * has permission {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}.
     *
     * @param phoneAccountHandle The handle for the {@link PhoneAccount} for which to set the
     * voicemail ringtone.
     * @param uri The URI for the ringtone to play when receiving a voicemail from a specific
     * PhoneAccount.
     */
    @Override
    public void setVoicemailRingtoneUri(String callingPackage,
            PhoneAccountHandle phoneAccountHandle, Uri uri) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        if (!TextUtils.equals(callingPackage,
                TelecomManager.from(mPhone.getContext()).getDefaultDialerPackage())) {
            TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                    mApp, PhoneUtils.getSubIdForPhoneAccountHandle(phoneAccountHandle),
                    "setVoicemailRingtoneUri");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = PhoneUtils.getPhoneForPhoneAccountHandle(phoneAccountHandle);
            if (phone == null) {
                phone = mPhone;
            }
            VoicemailNotificationSettingsUtil.setRingtoneUri(phone.getContext(), uri);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns whether vibration is set for voicemail notification in Phone settings.
     *
     * @param accountHandle The handle for the {@link PhoneAccount} for which to retrieve the
     * voicemail vibration setting.
     * @return {@code true} if the vibration is set for this PhoneAccount, {@code false} otherwise.
     */
    @Override
    public boolean isVoicemailVibrationEnabled(PhoneAccountHandle accountHandle) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = PhoneUtils.getPhoneForPhoneAccountHandle(accountHandle);
            if (phone == null) {
                phone = mPhone;
            }

            return VoicemailNotificationSettingsUtil.isVibrationEnabled(phone.getContext());
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Sets the per-account voicemail vibration.
     *
     * <p>Requires that the calling app is the default dialer, or has carrier privileges, or
     * has permission {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}.
     *
     * @param phoneAccountHandle The handle for the {@link PhoneAccount} for which to set the
     * voicemail vibration setting.
     * @param enabled Whether to enable or disable vibration for voicemail notifications from a
     * specific PhoneAccount.
     */
    @Override
    public void setVoicemailVibrationEnabled(String callingPackage,
            PhoneAccountHandle phoneAccountHandle, boolean enabled) {
        mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
        if (!TextUtils.equals(callingPackage,
                TelecomManager.from(mPhone.getContext()).getDefaultDialerPackage())) {
            TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                    mApp, PhoneUtils.getSubIdForPhoneAccountHandle(phoneAccountHandle),
                    "setVoicemailVibrationEnabled");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = PhoneUtils.getPhoneForPhoneAccountHandle(phoneAccountHandle);
            if (phone == null) {
                phone = mPhone;
            }
            VoicemailNotificationSettingsUtil.setVibrationEnabled(phone.getContext(), enabled);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Make sure either called from same process as self (phone) or IPC caller has read privilege.
     *
     * @throws SecurityException if the caller does not have the required permission
     */
    private void enforceReadPrivilegedPermission(String message) {
        mApp.enforceCallingOrSelfPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
                message);
    }

    /**
     * Make sure either called from same process as self (phone) or IPC caller has send SMS
     * permission.
     *
     * @throws SecurityException if the caller does not have the required permission
     */
    private void enforceSendSmsPermission() {
        mApp.enforceCallingOrSelfPermission(permission.SEND_SMS, null);
    }

    /**
     * Make sure called from the package in charge of visual voicemail.
     *
     * @throws SecurityException if the caller is not the visual voicemail package.
     */
    private void enforceVisualVoicemailPackage(String callingPackage, int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            ComponentName componentName =
                    RemoteVvmTaskManager.getRemotePackage(mPhone.getContext(), subId);
            if (componentName == null) {
                throw new SecurityException(
                        "Caller not current active visual voicemail package[null]");
            }
            String vvmPackage = componentName.getPackageName();
            if (!callingPackage.equals(vvmPackage)) {
                throw new SecurityException("Caller not current active visual voicemail package["
                        + vvmPackage + "]");
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Return the application ID for the app type.
     *
     * @param subId the subscription ID that this request applies to.
     * @param appType the uicc app type.
     * @return Application ID for specificied app type, or null if no uicc.
     */
    @Override
    public String getAidForAppType(int subId, int appType) {
        enforceReadPrivilegedPermission("getAidForAppType");
        Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone == null) {
                return null;
            }
            String aid = null;
            try {
                aid = UiccController.getInstance().getUiccCard(phone.getPhoneId())
                        .getApplicationByType(appType).getAid();
            } catch (Exception e) {
                Log.e(LOG_TAG, "Not getting aid. Exception ex=" + e);
            }
            return aid;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Return the Electronic Serial Number.
     *
     * @param subId the subscription ID that this request applies to.
     * @return ESN or null if error.
     */
    @Override
    public String getEsn(int subId) {
        enforceReadPrivilegedPermission("getEsn");
        Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone == null) {
                return null;
            }
            String esn = null;
            try {
                esn = phone.getEsn();
            } catch (Exception e) {
                Log.e(LOG_TAG, "Not getting ESN. Exception ex=" + e);
            }
            return esn;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Return the Preferred Roaming List Version.
     *
     * @param subId the subscription ID that this request applies to.
     * @return PRLVersion or null if error.
     */
    @Override
    public String getCdmaPrlVersion(int subId) {
        enforceReadPrivilegedPermission("getCdmaPrlVersion");
        Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone == null) {
                return null;
            }
            String cdmaPrlVersion = null;
            try {
                cdmaPrlVersion = phone.getCdmaPrlVersion();
            } catch (Exception e) {
                Log.e(LOG_TAG, "Not getting PRLVersion", e);
            }
            return cdmaPrlVersion;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get snapshot of Telephony histograms
     * @return List of Telephony histograms
     * @hide
     */
    @Override
    public List<TelephonyHistogram> getTelephonyHistograms() {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, getDefaultSubscription(), "getTelephonyHistograms");

        final long identity = Binder.clearCallingIdentity();
        try {
            return RIL.getTelephonyRILTimingHistograms();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * {@hide}
     * Set the allowed carrier list for slotIndex
     * Require system privileges. In the future we may add this to carrier APIs.
     *
     * @return The number of carriers set successfully, should match length of carriers
     */
    @Override
    public int setAllowedCarriers(int slotIndex, List<CarrierIdentifier> carriers) {
        enforceModifyPermission();
        WorkSource workSource = getWorkSource(Binder.getCallingUid());

        if (carriers == null) {
            throw new NullPointerException("carriers cannot be null");
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            int subId = SubscriptionManager.getSubId(slotIndex)[0];
            int[] retVal = (int[]) sendRequest(CMD_SET_ALLOWED_CARRIERS, carriers, subId,
                    workSource);
            return retVal[0];
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * {@hide}
     * Get the allowed carrier list for slotIndex.
     * Require system privileges. In the future we may add this to carrier APIs.
     *
     * @return List of {@link android.service.telephony.CarrierIdentifier}; empty list
     * means all carriers are allowed.
     */
    @Override
    public List<CarrierIdentifier> getAllowedCarriers(int slotIndex) {
        enforceReadPrivilegedPermission("getAllowedCarriers");
        WorkSource workSource = getWorkSource(Binder.getCallingUid());

        final long identity = Binder.clearCallingIdentity();
        try {
            int subId = SubscriptionManager.getSubId(slotIndex)[0];
            return (List<CarrierIdentifier>) sendRequest(CMD_GET_ALLOWED_CARRIERS, null, subId,
                    workSource);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Action set from carrier signalling broadcast receivers to enable/disable metered apns
     * @param subId the subscription ID that this action applies to.
     * @param enabled control enable or disable metered apns.
     * {@hide}
     */
    @Override
    public void carrierActionSetMeteredApnsEnabled(int subId, boolean enabled) {
        enforceModifyPermission();
        final Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        if (phone == null) {
            loge("carrierAction: SetMeteredApnsEnabled fails with invalid subId: " + subId);
            return;
        }
        try {
            phone.carrierActionSetMeteredApnsEnabled(enabled);
        } catch (Exception e) {
            Log.e(LOG_TAG, "carrierAction: SetMeteredApnsEnabled fails. Exception ex=" + e);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Action set from carrier signalling broadcast receivers to enable/disable radio
     * @param subId the subscription ID that this action applies to.
     * @param enabled control enable or disable radio.
     * {@hide}
     */
    @Override
    public void carrierActionSetRadioEnabled(int subId, boolean enabled) {
        enforceModifyPermission();
        final Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        if (phone == null) {
            loge("carrierAction: SetRadioEnabled fails with invalid sibId: " + subId);
            return;
        }
        try {
            phone.carrierActionSetRadioEnabled(enabled);
        } catch (Exception e) {
            Log.e(LOG_TAG, "carrierAction: SetRadioEnabled fails. Exception ex=" + e);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Action set from carrier signalling broadcast receivers to start/stop reporting the default
     * network status based on which carrier apps could apply actions accordingly,
     * enable/disable default url handler for example.
     *
     * @param subId the subscription ID that this action applies to.
     * @param report control start/stop reporting the default network status.
     * {@hide}
     */
    @Override
    public void carrierActionReportDefaultNetworkStatus(int subId, boolean report) {
        enforceModifyPermission();
        final Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        if (phone == null) {
            loge("carrierAction: ReportDefaultNetworkStatus fails with invalid sibId: " + subId);
            return;
        }
        try {
            phone.carrierActionReportDefaultNetworkStatus(report);
        } catch (Exception e) {
            Log.e(LOG_TAG, "carrierAction: ReportDefaultNetworkStatus fails. Exception ex=" + e);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Called when "adb shell dumpsys phone" is invoked. Dump is also automatically invoked when a
     * bug report is being generated.
     */
    @Override
    protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
        if (mPhone.getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
                != PackageManager.PERMISSION_GRANTED) {
            writer.println("Permission Denial: can't dump Phone from pid="
                    + Binder.getCallingPid()
                    + ", uid=" + Binder.getCallingUid()
                    + "without permission "
                    + android.Manifest.permission.DUMP);
            return;
        }
        DumpsysHandler.dump(mPhone.getContext(), fd, writer, args);
    }

    @Override
    public void onShellCommand(FileDescriptor in, FileDescriptor out, FileDescriptor err,
            String[] args, ShellCallback callback, ResultReceiver resultReceiver)
            throws RemoteException {
        (new TelephonyShellCommand(this)).exec(this, in, out, err, args, callback, resultReceiver);
    }

    /**
     * Get aggregated video call data usage since boot.
     *
     * @param perUidStats True if requesting data usage per uid, otherwise overall usage.
     * @return Snapshot of video call data usage
     * {@hide}
     */
    @Override
    public NetworkStats getVtDataUsage(int subId, boolean perUidStats) {
        mApp.enforceCallingOrSelfPermission(android.Manifest.permission.READ_NETWORK_USAGE_HISTORY,
                null);

        final long identity = Binder.clearCallingIdentity();
        try {
            // NetworkStatsService keeps tracking the active network interface and identity. It
            // records the delta with the corresponding network identity.
            // We just return the total video call data usage snapshot since boot.
            Phone phone = getPhone(subId);
            if (phone != null) {
                return phone.getVtDataUsage(perUidStats);
            }
            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Policy control of data connection. Usually used when data limit is passed.
     * @param enabled True if enabling the data, otherwise disabling.
     * @param subId Subscription index
     * {@hide}
     */
    @Override
    public void setPolicyDataEnabled(boolean enabled, int subId) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setPolicyDataEnabled(enabled);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get Client request stats
     * @return List of Client Request Stats
     * @hide
     */
    @Override
    public List<ClientRequestStats> getClientRequestStats(String callingPackage, int subId) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getClientRequestStats")) {
            return null;
        }
        Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone != null) {
                return phone.getClientRequestStats();
            }

            return null;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private WorkSource getWorkSource(int uid) {
        String packageName = mPhone.getContext().getPackageManager().getNameForUid(uid);
        return new WorkSource(uid, packageName);
    }

    /**
     * Set SIM card power state.
     *
     * @param slotIndex SIM slot id.
     * @param state  State of SIM (power down, power up, pass through)
     * - {@link android.telephony.TelephonyManager#CARD_POWER_DOWN}
     * - {@link android.telephony.TelephonyManager#CARD_POWER_UP}
     * - {@link android.telephony.TelephonyManager#CARD_POWER_UP_PASS_THROUGH}
     *
     **/
    @Override
    public void setSimPowerStateForSlot(int slotIndex, int state) {
        enforceModifyPermission();
        Phone phone = PhoneFactory.getPhone(slotIndex);

        WorkSource workSource = getWorkSource(Binder.getCallingUid());

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone != null) {
                phone.setSimPowerState(state, workSource);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private boolean isUssdApiAllowed(int subId) {
        CarrierConfigManager configManager =
                (CarrierConfigManager) mPhone.getContext().getSystemService(
                        Context.CARRIER_CONFIG_SERVICE);
        if (configManager == null) {
            return false;
        }
        PersistableBundle pb = configManager.getConfigForSubId(subId);
        if (pb == null) {
            return false;
        }
        return pb.getBoolean(
                CarrierConfigManager.KEY_ALLOW_USSD_REQUESTS_VIA_TELEPHONY_MANAGER_BOOL);
    }

    /**
     * Check if phone is in emergency callback mode
     * @return true if phone is in emergency callback mode
     * @param subId sub id
     */
    @Override
    public boolean getEmergencyCallbackMode(int subId) {
        enforceReadPrivilegedPermission("getEmergencyCallbackMode");
        final Phone phone = getPhone(subId);

        final long identity = Binder.clearCallingIdentity();
        try {
            if (phone != null) {
                return phone.isInEcm();
            } else {
                return false;
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Get the current signal strength information for the given subscription.
     * Because this information is not updated when the device is in a low power state
     * it should not be relied-upon to be current.
     * @param subId Subscription index
     * @return the most recent cached signal strength info from the modem
     */
    @Override
    public SignalStrength getSignalStrength(int subId) {
        final long identity = Binder.clearCallingIdentity();
        try {
            Phone p = getPhone(subId);
            if (p == null) {
                return null;
            }

            return p.getSignalStrength();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Checks if data roaming is enabled on the subscription with id {@code subId}.
     *
     * <p>Requires one of the following permissions:
     * {@link android.Manifest.permission#ACCESS_NETWORK_STATE},
     * {@link android.Manifest.permission#READ_PHONE_STATE} or that the calling app has carrier
     * privileges.
     *
     * @param subId subscription id
     * @return {@code true} if data roaming is enabled on this subscription, otherwise return
     * {@code false}.
     */
    @Override
    public boolean isDataRoamingEnabled(int subId) {
        boolean isEnabled = false;
        final long identity = Binder.clearCallingIdentity();
        try {
            mApp.enforceCallingOrSelfPermission(android.Manifest.permission.ACCESS_NETWORK_STATE,
                    null /* message */);
            Phone phone = getPhone(subId);
            isEnabled =  phone != null ? phone.getDataRoamingEnabled() : false;
        } catch (Exception e) {
            TelephonyPermissions.enforeceCallingOrSelfReadPhoneStatePermissionOrCarrierPrivilege(
                    mApp, subId, "isDataRoamingEnabled");
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
        return isEnabled;
    }


    /**
     * Enables/Disables the data roaming on the subscription with id {@code subId}.
     *
     * <p> Requires permission:
     * {@link android.Manifest.permission#MODIFY_PHONE_STATE} or that the calling app has carrier
     * privileges.
     *
     * @param subId subscription id
     * @param isEnabled {@code true} means enable, {@code false} means disable.
     */
    @Override
    public void setDataRoamingEnabled(int subId, boolean isEnabled) {
        final long identity = Binder.clearCallingIdentity();
        try {
            TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                    mApp, subId, "setDataRoamingEnabled");

            Phone phone = getPhone(subId);
            if (phone != null) {
                phone.setDataRoamingEnabled(isEnabled);
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean isManualNetworkSelectionAllowed(int subId) {
        boolean isAllowed = true;
        final long identity = Binder.clearCallingIdentity();
        try {
            TelephonyPermissions.enforeceCallingOrSelfReadPhoneStatePermissionOrCarrierPrivilege(
                    mApp, subId, "isManualNetworkSelectionAllowed");
            Phone phone = getPhone(subId);
            if (phone != null) {
                isAllowed = phone.isCspPlmnEnabled();
            }
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
        return isAllowed;
    }

    @Override
    public UiccSlotInfo[] getUiccSlotsInfo() {
        enforceReadPrivilegedPermission("getUiccSlotsInfo");

        final long identity = Binder.clearCallingIdentity();
        try {
            UiccSlot[] slots = UiccController.getInstance().getUiccSlots();
            if (slots == null) {
                Rlog.i(LOG_TAG, "slots is null.");
                return null;
            }

            UiccSlotInfo[] infos = new UiccSlotInfo[slots.length];
            for (int i = 0; i < slots.length; i++) {
                UiccSlot slot = slots[i];
                if (slot == null) {
                    continue;
                }

                String cardId;
                UiccCard card = slot.getUiccCard();
                if (card != null) {
                    cardId = card.getCardId();
                } else {
                    cardId = slot.getIccId();
                }

                int cardState = 0;
                switch (slot.getCardState()) {
                    case CARDSTATE_ABSENT:
                        cardState = UiccSlotInfo.CARD_STATE_INFO_ABSENT;
                        break;
                    case CARDSTATE_PRESENT:
                        cardState = UiccSlotInfo.CARD_STATE_INFO_PRESENT;
                        break;
                    case CARDSTATE_ERROR:
                        cardState = UiccSlotInfo.CARD_STATE_INFO_ERROR;
                        break;
                    case CARDSTATE_RESTRICTED:
                        cardState = UiccSlotInfo.CARD_STATE_INFO_RESTRICTED;
                        break;
                    default:
                        break;

                }

                infos[i] = new UiccSlotInfo(
                        slot.isActive(),
                        slot.isEuicc(),
                        cardId,
                        cardState,
                        slot.getPhoneId(),
                        slot.isExtendedApduSupported());
            }
            return infos;
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean switchSlots(int[] physicalSlots) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            return (Boolean) sendRequest(CMD_SWITCH_SLOTS, physicalSlots);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public void setRadioIndicationUpdateMode(int subId, int filters, int mode) {
        enforceModifyPermission();
        final Phone phone = getPhone(subId);
        if (phone == null) {
            loge("setRadioIndicationUpdateMode fails with invalid subId: " + subId);
            return;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            phone.setRadioIndicationUpdateMode(filters, mode);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * A test API to reload the UICC profile.
     *
     * <p>Requires that the calling app has permission
     * {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}.
     * @hide
     */
    @Override
    public void refreshUiccProfile(int subId) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            Phone phone = getPhone(subId);
            if (phone == null) {
                return;
            }
            UiccCard uiccCard = phone.getUiccCard();
            if (uiccCard == null) {
                return;
            }
            UiccProfile uiccProfile = uiccCard.getUiccProfile();
            if (uiccProfile == null) {
                return;
            }
            uiccProfile.refresh();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    /**
     * Returns false if the mobile data is disabled by default, otherwise return true.
     */
    private boolean getDefaultDataEnabled() {
        return "true".equalsIgnoreCase(
                SystemProperties.get(DEFAULT_MOBILE_DATA_PROPERTY_NAME, "true"));
    }

    /**
     * Returns true if the data roaming is enabled by default, i.e the system property
     * of {@link #DEFAULT_DATA_ROAMING_PROPERTY_NAME} is true or the config of
     * {@link CarrierConfigManager#KEY_CARRIER_DEFAULT_DATA_ROAMING_ENABLED_BOOL} is true.
     */
    private boolean getDefaultDataRoamingEnabled(int subId) {
        final CarrierConfigManager configMgr = (CarrierConfigManager)
                mPhone.getContext().getSystemService(Context.CARRIER_CONFIG_SERVICE);
        boolean isDataRoamingEnabled = "true".equalsIgnoreCase(
                SystemProperties.get(DEFAULT_DATA_ROAMING_PROPERTY_NAME, "false"));
        isDataRoamingEnabled |= configMgr.getConfigForSubId(subId).getBoolean(
                CarrierConfigManager.KEY_CARRIER_DEFAULT_DATA_ROAMING_ENABLED_BOOL);
        return isDataRoamingEnabled;
    }

    /**
     * Returns the default network type for the given {@code subId}, if the default network type is
     * not set, return {@link Phone#PREFERRED_NT_MODE}.
     */
    private int getDefaultNetworkType(int subId) {
        return Integer.parseInt(
                TelephonyManager.getTelephonyProperty(
                        mSubscriptionController.getPhoneId(subId),
                        DEFAULT_NETWORK_MODE_PROPERTY_NAME,
                        String.valueOf(Phone.PREFERRED_NT_MODE)));
    }

    @Override
    public void setCarrierTestOverride(int subId, String mccmnc, String imsi, String iccid, String
            gid1, String gid2, String plmn, String spn) {
        enforceModifyPermission();

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                loge("setCarrierTestOverride fails with invalid subId: " + subId);
                return;
            }
            phone.setCarrierTestOverride(mccmnc, imsi, iccid, gid1, gid2, plmn, spn);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getCarrierIdListVersion(int subId) {
        enforceReadPrivilegedPermission("getCarrierIdListVersion");

        final long identity = Binder.clearCallingIdentity();
        try {
            final Phone phone = getPhone(subId);
            if (phone == null) {
                loge("getCarrierIdListVersion fails with invalid subId: " + subId);
                return TelephonyManager.UNKNOWN_CARRIER_ID_LIST_VERSION;
            }
            return phone.getCarrierIdListVersion();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getNumberOfModemsWithSimultaneousDataConnections(int subId, String callingPackage) {
        if (!TelephonyPermissions.checkCallingOrSelfReadPhoneState(
                mApp, subId, callingPackage, "getNumberOfModemsWithSimultaneousDataConnections")) {
            return -1;
        }

        final long identity = Binder.clearCallingIdentity();
        try {
            return mPhoneConfigurationManager.getNumberOfModemsWithSimultaneousDataConnections();
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public int getCdmaRoamingMode(int subId) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "getCdmaRoamingMode");

        final long identity = Binder.clearCallingIdentity();
        try {
            return (int) sendRequest(CMD_GET_CDMA_ROAMING_MODE, null /* argument */, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean setCdmaRoamingMode(int subId, int mode) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setCdmaRoamingMode");

        final long identity = Binder.clearCallingIdentity();
        try {
            return (boolean) sendRequest(CMD_SET_CDMA_ROAMING_MODE, mode, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    @Override
    public boolean setCdmaSubscriptionMode(int subId, int mode) {
        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                mApp, subId, "setCdmaSubscriptionMode");

        final long identity = Binder.clearCallingIdentity();
        try {
            return (boolean) sendRequest(CMD_SET_CDMA_SUBSCRIPTION_MODE, mode, subId);
        } finally {
            Binder.restoreCallingIdentity(identity);
        }
    }

    private void ensureUserRunning(int userId) {
        if (!mUserManager.isUserRunning(userId)) {
            throw new IllegalStateException("User " + userId + " does not exist or not running");
        }
    }

    /**
     * Returns a list of SMS apps on a given user.
     *
     * Only the shell user (UID 2000 or 0) can call it.
     * Target user must be running.
     */
    @Override
    public String[] getSmsApps(int userId) {
        TelephonyPermissions.enforceShellOnly(Binder.getCallingUid(), "getSmsApps");
        ensureUserRunning(userId);

        final Collection<SmsApplicationData> apps =
                SmsApplication.getApplicationCollectionAsUser(mApp, userId);

        String[] ret = new String[apps.size()];
        int i = 0;
        for (SmsApplicationData app : apps) {
            ret[i++] = app.mPackageName;
        }
        return ret;
    }

    /**
     * Returns the default SMS app package name on a given user.
     *
     * Only the shell user (UID 2000 or 0) can call it.
     * Target user must be running.
     */
    @Override
    public String getDefaultSmsApp(int userId) {
        TelephonyPermissions.enforceShellOnly(Binder.getCallingUid(), "getDefaultSmsApp");
        ensureUserRunning(userId);

        final ComponentName cn = SmsApplication.getDefaultSmsApplicationAsUser(mApp,
                /* updateIfNeeded= */ true, userId);
        return cn == null ? null : cn.getPackageName();
    }

    /**
     * Set a package as the default SMS app on a given user.
     *
     * Only the shell user (UID 2000 or 0) can call it.
     * Target user must be running.
     */
    @Override
    public void setDefaultSmsApp(int userId, String packageName) {
        TelephonyPermissions.enforceShellOnly(Binder.getCallingUid(), "setDefaultSmsApp");
        ensureUserRunning(userId);

        boolean found = false;
        for (String pkg : getSmsApps(userId)) {
            if (TextUtils.equals(packageName, pkg)) {
                found = true;
                break;
            }
        }
        if (!found) {
            throw new IllegalArgumentException("Package " + packageName + " is not an SMS app");
        }

        SmsApplication.setDefaultApplicationAsUser(packageName, mApp, userId);
    }
}