Merge "Disable VT when TTY is enabled during a VOLTE call."
diff --git a/res/drawable/signal_strength_4g.xml b/res/drawable/signal_strength_4g.xml
new file mode 100644
index 0000000..9062096
--- /dev/null
+++ b/res/drawable/signal_strength_4g.xml
@@ -0,0 +1,28 @@
+<!--
+Copyright (C) 2014 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="9.208dp"
+    android:height="17dp"
+    android:viewportWidth="13.0"
+    android:viewportHeight="24.0"
+    android:tint="?android:attr/colorControlNormal">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M4.600000,7.800000l0.700000,0.000000l0.000000,1.300000L4.600000,9.100000L4.600000,11.000000L3.000000,11.000000L3.000000,9.200000L0.100000,9.200000L0.000000,8.100000L3.000000,2.500000l1.700000,0.000000L4.700000,7.800000zM1.600000,7.800000L3.000000,7.800000l0.000000,-3.000000L2.900000,5.000000L1.600000,7.800000z"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M11.900000,9.900000c-0.200000,0.400000 -0.600000,0.700000 -1.000000,0.900000s-1.000000,0.400000 -1.800000,0.400000c-0.900000,0.000000 -1.700000,-0.300000 -2.200000,-0.800000S6.100000,9.000000 6.100000,7.900000L6.100000,5.600000c0.000000,-1.100000 0.300000,-1.900000 0.800000,-2.400000S8.100000,2.400000 9.000000,2.400000c1.000000,0.000000 1.700000,0.200000 2.100000,0.700000s0.700000,1.200000 0.700000,2.100000l-1.600000,0.000000c0.000000,-0.500000 -0.100000,-0.900000 -0.200000,-1.100000S9.500000,3.700000 9.000000,3.700000c-0.400000,0.000000 -0.700000,0.200000 -0.900000,0.500000S7.700000,5.000000 7.700000,5.600000l0.000000,2.300000c0.000000,0.700000 0.100000,1.100000 0.300000,1.400000s0.600000,0.500000 1.000000,0.500000c0.300000,0.000000 0.600000,0.000000 0.700000,-0.100000s0.300000,-0.200000 0.400000,-0.300000L10.099999,7.800000L9.000000,7.800000L9.000000,6.600000l2.900000,0.000000L11.900000,9.900000z"/>
+</vector>
\ No newline at end of file
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 7773af6..de14389 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1074,8 +1074,8 @@
     <!-- Label for the "No service" notification item, when expanded. -->
     <string name="notification_network_selection_title">No service</string>
     <!-- Label for the expanded "No service" notification item, including the
-         operator name set by user -->
-    <string name="notification_network_selection_text">Selected network (<xliff:g id="operator_name">%s</xliff:g>) unavailable</string>
+         operator name set by user. No space after "network", appended in nonempty value. -->
+    <string name="notification_network_selection_text">Selected network<xliff:g id="operator_name">%s</xliff:g> unavailable</string>
 
     <!-- In-call screen: call failure message displayed in an error dialog. [CHAR_LIMIT=NONE] -->
     <string name="incall_error_power_off" product="watch">Turn on mobile network, turn off airplane mode or turn off battery saver mode to make a call.</string>
diff --git a/src/com/android/phone/CallForwardEditPreference.java b/src/com/android/phone/CallForwardEditPreference.java
index bfeee7a..bdffb26 100644
--- a/src/com/android/phone/CallForwardEditPreference.java
+++ b/src/com/android/phone/CallForwardEditPreference.java
@@ -76,6 +76,11 @@
         mReplaceInvalidCFNumber = replaceInvalidCFNumber;
     }
 
+    void restoreCallForwardInfo(CallForwardInfo cf) {
+        handleCallForwardResult(cf);
+        updateSummaryText();
+    }
+
     @Override
     protected void onBindDialogView(View view) {
         // default the button clicked to be the cancel button.
@@ -100,7 +105,15 @@
             int action = (isToggled() || (mButtonClicked == DialogInterface.BUTTON_POSITIVE)) ?
                     CommandsInterface.CF_ACTION_REGISTRATION :
                     CommandsInterface.CF_ACTION_DISABLE;
-            int time = (reason != CommandsInterface.CF_REASON_NO_REPLY) ? 0 : 20;
+            int time = 0;
+            if (reason == CommandsInterface.CF_REASON_NO_REPLY) {
+                PersistableBundle carrierConfig = PhoneGlobals.getInstance()
+                        .getCarrierConfigForSubId(mPhone.getSubId());
+                if (carrierConfig.getBoolean(
+                        CarrierConfigManager.KEY_SUPPORT_NO_REPLY_TIMER_FOR_CFNRY_BOOL, true)) {
+                    time = 20;
+                }
+            }
             final String number = getPhoneNumber();
 
             Log.d(LOG_TAG, "callForwardInfo=" + callForwardInfo);
@@ -137,7 +150,7 @@
         }
     }
 
-    void handleCallForwardResult(CallForwardInfo cf) {
+    private void handleCallForwardResult(CallForwardInfo cf) {
         callForwardInfo = cf;
         Log.d(LOG_TAG, "handleGetCFResponse done, callForwardInfo=" + callForwardInfo);
         // In some cases, the network can send call forwarding URIs for voicemail that violate the
diff --git a/src/com/android/phone/CdmaOptions.java b/src/com/android/phone/CdmaOptions.java
index 70744e5..9c713ef 100644
--- a/src/com/android/phone/CdmaOptions.java
+++ b/src/com/android/phone/CdmaOptions.java
@@ -39,6 +39,7 @@
 public class CdmaOptions {
     private static final String LOG_TAG = "CdmaOptions";
 
+    private CarrierConfigManager mCarrierConfigManager;
     private CdmaSystemSelectListPreference mButtonCdmaSystemSelect;
     private CdmaSubscriptionListPreference mButtonCdmaSubscription;
     private RestrictedPreference mButtonAPNExpand;
@@ -59,6 +60,7 @@
         mPrefFragment = prefFragment;
         mPrefScreen = prefScreen;
         mPrefFragment.addPreferencesFromResource(R.xml.cdma_options);
+        mCarrierConfigManager = new CarrierConfigManager(prefFragment.getContext());
 
         // Initialize preferences.
         mButtonCdmaSystemSelect = (CdmaSystemSelectListPreference) mPrefScreen
@@ -77,8 +79,7 @@
         int phoneType = TelephonyManager.from(mPrefFragment.getContext())
                 .createForSubscriptionId(mSubId).getPhoneType();
 
-        PersistableBundle carrierConfig =
-                PhoneGlobals.getInstance().getCarrierConfigForSubId(mSubId);
+        PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
         // Some CDMA carriers want the APN settings.
         boolean addAPNExpand = shouldAddApnExpandPreference(phoneType, carrierConfig);
         boolean addCdmaSubscription =
diff --git a/src/com/android/phone/GsmUmtsCallForwardOptions.java b/src/com/android/phone/GsmUmtsCallForwardOptions.java
index e562e46..6d80621 100644
--- a/src/com/android/phone/GsmUmtsCallForwardOptions.java
+++ b/src/com/android/phone/GsmUmtsCallForwardOptions.java
@@ -31,6 +31,7 @@
     private static final String KEY_TOGGLE = "toggle";
     private static final String KEY_STATUS = "status";
     private static final String KEY_NUMBER = "number";
+    private static final String KEY_ENABLE = "enable";
 
     private CallForwardEditPreference mButtonCFU;
     private CallForwardEditPreference mButtonCFB;
@@ -112,11 +113,12 @@
                 for (CallForwardEditPreference pref : mPreferences) {
                     Bundle bundle = mIcicle.getParcelable(pref.getKey());
                     pref.setToggled(bundle.getBoolean(KEY_TOGGLE));
+                    pref.setEnabled(bundle.getBoolean(KEY_ENABLE));
                     CallForwardInfo cf = new CallForwardInfo();
                     cf.number = bundle.getString(KEY_NUMBER);
                     cf.status = bundle.getInt(KEY_STATUS);
                     pref.init(this, mPhone, mReplaceInvalidCFNumbers);
-                    pref.handleCallForwardResult(cf);
+                    pref.restoreCallForwardInfo(cf);
                 }
             }
             mFirstResume = false;
@@ -131,6 +133,7 @@
         for (CallForwardEditPreference pref : mPreferences) {
             Bundle bundle = new Bundle();
             bundle.putBoolean(KEY_TOGGLE, pref.isToggled());
+            bundle.putBoolean(KEY_ENABLE, pref.isEnabled());
             if (pref.callForwardInfo != null) {
                 bundle.putString(KEY_NUMBER, pref.callForwardInfo.number);
                 bundle.putInt(KEY_STATUS, pref.callForwardInfo.status);
diff --git a/src/com/android/phone/GsmUmtsOptions.java b/src/com/android/phone/GsmUmtsOptions.java
index 19cd3ef..a3f5cfb 100644
--- a/src/com/android/phone/GsmUmtsOptions.java
+++ b/src/com/android/phone/GsmUmtsOptions.java
@@ -16,6 +16,7 @@
 
 package com.android.phone;
 
+import android.content.Context;
 import android.content.Intent;
 import android.os.PersistableBundle;
 import android.preference.Preference;
@@ -23,6 +24,7 @@
 import android.preference.PreferenceScreen;
 import android.provider.Settings;
 import android.telephony.CarrierConfigManager;
+import android.telephony.TelephonyManager;
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
@@ -36,6 +38,7 @@
 public class GsmUmtsOptions {
     private static final String LOG_TAG = "GsmUmtsOptions";
 
+    private CarrierConfigManager mCarrierConfigManager;
     private RestrictedPreference mButtonAPNExpand;
     private Preference mCategoryAPNExpand;
     Preference mCarrierSettingPref;
@@ -52,8 +55,10 @@
 
     public GsmUmtsOptions(PreferenceFragment prefFragment, PreferenceScreen prefScreen,
             final int subId, INetworkQueryService queryService) {
+        final Context context = prefFragment.getContext();
         mPrefFragment = prefFragment;
         mPrefScreen = prefScreen;
+        mCarrierConfigManager = new CarrierConfigManager(context);
         mPrefFragment.addPreferencesFromResource(R.xml.gsm_umts_options);
         mButtonAPNExpand = (RestrictedPreference) mPrefScreen.findPreference(BUTTON_APN_EXPAND_KEY);
         mCategoryAPNExpand = mPrefScreen.findPreference(CATEGORY_APN_EXPAND_KEY);
@@ -72,16 +77,17 @@
         boolean addAPNExpand = true;
         boolean addNetworkOperatorsCategory = true;
         boolean addCarrierSettings = true;
+        final TelephonyManager telephonyManager = TelephonyManager.from(mPrefFragment.getContext())
+                .createForSubscriptionId(subId);
         Phone phone = PhoneGlobals.getPhone(subId);
         if (phone == null) return;
-        if (phone.getPhoneType() != PhoneConstants.PHONE_TYPE_GSM) {
+        if (telephonyManager.getPhoneType() != PhoneConstants.PHONE_TYPE_GSM) {
             log("Not a GSM phone");
             addAPNExpand = false;
             mNetworkOperator.setEnabled(false);
         } else {
             log("Not a CDMA phone");
-            PersistableBundle carrierConfig =
-                    PhoneGlobals.getInstance().getCarrierConfigForSubId(subId);
+            PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(subId);
 
             // Determine which options to display. For GSM these are defaulted to true in
             // CarrierConfigManager, but they maybe overriden by DefaultCarrierConfigService or a
diff --git a/src/com/android/phone/MobileNetworkSettings.java b/src/com/android/phone/MobileNetworkSettings.java
index 7a795ed..c4f91ca 100644
--- a/src/com/android/phone/MobileNetworkSettings.java
+++ b/src/com/android/phone/MobileNetworkSettings.java
@@ -239,15 +239,16 @@
      * doesn't set {@link CarrierConfigManager#KEY_HIDE_ENHANCED_4G_LTE_BOOL} to false.
      */
     public static boolean hideEnhanced4gLteSettings(Context context) {
-        List<SubscriptionInfo> sil =
+        final CarrierConfigManager carrierConfigManager = new CarrierConfigManager(context);
+        final List<SubscriptionInfo> sil =
                 SubscriptionManager.from(context).getActiveSubscriptionInfoList();
         // Check all active subscriptions. We only hide the button if it's disabled for all
         // active subscriptions.
         if (sil != null) {
             for (SubscriptionInfo subInfo : sil) {
                 ImsManager imsManager = ImsManager.getInstance(context, subInfo.getSimSlotIndex());
-                PersistableBundle carrierConfig = PhoneGlobals.getInstance()
-                        .getCarrierConfigForSubId(subInfo.getSubscriptionId());
+                PersistableBundle carrierConfig = carrierConfigManager.getConfigForSubId(
+                        subInfo.getSubscriptionId());
                 if ((imsManager.isVolteEnabledByPlatform()
                         && imsManager.isVolteProvisionedOnDevice())
                         || carrierConfig.getBoolean(
@@ -347,6 +348,7 @@
 
         private SubscriptionManager mSubscriptionManager;
         private TelephonyManager mTelephonyManager;
+        private CarrierConfigManager mCarrierConfigManager;
         private int mSubId;
 
         //UI objects
@@ -788,6 +790,7 @@
             mSubscriptionManager = SubscriptionManager.from(activity);
             mTelephonyManager = (TelephonyManager) activity.getSystemService(
                             Context.TELEPHONY_SERVICE);
+            mCarrierConfigManager = new CarrierConfigManager(getContext());
 
             if (icicle != null) {
                 mExpandAdvancedFields = icicle.getBoolean(EXPAND_ADVANCED_FIELDS, false);
@@ -1052,8 +1055,7 @@
                     android.provider.Settings.Global.PREFERRED_NETWORK_MODE + phoneSubId,
                     preferredNetworkMode);
 
-            PersistableBundle carrierConfig =
-                    PhoneGlobals.getInstance().getCarrierConfigForSubId(mSubId);
+            PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
             mIsGlobalCdma = isLteOnCdma
                     && carrierConfig.getBoolean(CarrierConfigManager.KEY_SHOW_CDMA_CHOICES_BOOL);
             if (carrierConfig.getBoolean(
@@ -1200,8 +1202,7 @@
         // Requires that mSubId is up to date
         void updateEnabledNetworksEntries() {
             final int phoneType = mTelephonyManager.getPhoneType();
-            final PersistableBundle carrierConfig =
-                    PhoneGlobals.getInstance().getCarrierConfigForSubId(mSubId);
+            final PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
             if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
                 final int lteForced = android.provider.Settings.Global.getInt(
                         getContext().getContentResolver(),
@@ -1444,8 +1445,8 @@
 
                 //normally called on the toggle click
                 if (!mButtonDataRoam.isChecked()) {
-                    PersistableBundle carrierConfig =
-                            PhoneGlobals.getInstance().getCarrierConfigForSubId(mSubId);
+                    PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(
+                            mSubId);
                     if (carrierConfig != null && carrierConfig.getBoolean(
                             CarrierConfigManager.KEY_DISABLE_CHARGE_INDICATION_BOOL)) {
                         mTelephonyManager.setDataRoamingEnabled(true);
@@ -1885,8 +1886,7 @@
                 return;
             }
 
-            PersistableBundle carrierConfig = PhoneGlobals.getInstance()
-                    .getCarrierConfigForSubId(mSubId);
+            PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
 
             if ((mImsMgr == null
                     || !mImsMgr.isVolteEnabledByPlatform()
@@ -1909,8 +1909,7 @@
                 return;
             }
 
-            PersistableBundle carrierConfig = PhoneGlobals.getInstance()
-                    .getCarrierConfigForSubId(mSubId);
+            PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
 
             if (mImsMgr != null
                     && mImsMgr.isVtEnabledByPlatform()
diff --git a/src/com/android/phone/NetworkOperatorPreference.java b/src/com/android/phone/NetworkOperatorPreference.java
index e582924..09c494c 100644
--- a/src/com/android/phone/NetworkOperatorPreference.java
+++ b/src/com/android/phone/NetworkOperatorPreference.java
@@ -43,16 +43,18 @@
     private CellInfo mCellInfo;
     private List<String> mForbiddenPlmns;
     private int mLevel = -1;
+    private boolean mShow4GForLTE;
 
     // The following constants are used to draw signal icon.
     private static final Drawable EMPTY_DRAWABLE = new ColorDrawable(Color.TRANSPARENT);
     private static final int NO_CELL_DATA_CONNECTED_ICON = 0;
 
     public NetworkOperatorPreference(
-            CellInfo cellinfo, Context context, List<String> forbiddenPlmns) {
+            CellInfo cellinfo, Context context, List<String> forbiddenPlmns, boolean show4GForLTE) {
         super(context);
         mCellInfo = cellinfo;
         mForbiddenPlmns = forbiddenPlmns;
+        mShow4GForLTE = show4GForLTE;
         refresh();
     }
 
@@ -85,13 +87,15 @@
         updateIcon(level);
     }
 
-    private static int getIconIdForCell(CellInfo ci) {
+    private int getIconIdForCell(CellInfo ci) {
         final int type = ci.getCellIdentity().getType();
         switch (type) {
             case CellInfo.TYPE_GSM: return R.drawable.signal_strength_g;
             case CellInfo.TYPE_WCDMA: // fall through
             case CellInfo.TYPE_TDSCDMA: return R.drawable.signal_strength_3g;
-            case CellInfo.TYPE_LTE: return R.drawable.signal_strength_lte;
+            case CellInfo.TYPE_LTE:
+                return mShow4GForLTE
+                        ? R.drawable.signal_strength_4g : R.drawable.signal_strength_lte;
             case CellInfo.TYPE_CDMA: return R.drawable.signal_strength_1x;
             default: return 0;
         }
diff --git a/src/com/android/phone/NetworkOperators.java b/src/com/android/phone/NetworkOperators.java
index 6d8b30f..6d798b0 100644
--- a/src/com/android/phone/NetworkOperators.java
+++ b/src/com/android/phone/NetworkOperators.java
@@ -29,6 +29,7 @@
 import android.telephony.TelephonyManager;
 import android.util.AttributeSet;
 import android.util.Log;
+import android.widget.Toast;
 
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
@@ -193,25 +194,12 @@
 
     // Used by both mAutoSelect and mNetworkSelect buttons.
     protected void displayNetworkSelectionFailed() {
-        String status = getContext().getResources().getString(R.string.connect_later);
-
-        final PhoneGlobals app = PhoneGlobals.getInstance();
-        app.notificationMgr.postTransientNotification(
-                NotificationMgr.NETWORK_SELECTION_NOTIFICATION, status);
-
-        ServiceState ss = mTelephonyManager.getServiceStateForSubscriber(mSubId);
-        if (ss != null) {
-            app.notificationMgr.updateNetworkSelection(ss.getState(), mSubId);
-        }
+        Toast.makeText(getContext(), R.string.connect_later, Toast.LENGTH_LONG).show();
     }
 
     // Used by both mAutoSelect and mNetworkSelect buttons.
     protected void displayNetworkSelectionSucceeded() {
-        String status = getContext().getResources().getString(R.string.registration_done);
-
-        final PhoneGlobals app = PhoneGlobals.getInstance();
-        app.notificationMgr.postTransientNotification(
-                NotificationMgr.NETWORK_SELECTION_NOTIFICATION, status);
+        Toast.makeText(getContext(), R.string.registration_done, Toast.LENGTH_LONG).show();
     }
 
     private void selectNetworkAutomatic(boolean autoSelect) {
diff --git a/src/com/android/phone/NetworkSelectListPreference.java b/src/com/android/phone/NetworkSelectListPreference.java
index cec914a..5b841c9 100644
--- a/src/com/android/phone/NetworkSelectListPreference.java
+++ b/src/com/android/phone/NetworkSelectListPreference.java
@@ -403,8 +403,7 @@
                 final OperatorInfo operatorInfo = getOperatorInfoFromCellInfo(mCellInfo);
                 if (DBG) logd("manually selected network: " + operatorInfo.toString());
                 boolean isSuccessed = mTelephonyManager.setNetworkSelectionModeManual(
-                        operatorInfo.getOperatorNumeric(), true /* persistSelection */);
-                int mode = mTelephonyManager.getNetworkSelectionMode();
+                        operatorInfo, true /* persistSelection */);
                 Message msg = mHandler.obtainMessage(EVENT_MANUALLY_NETWORK_SELECTION_DONE);
                 msg.obj = isSuccessed;
                 msg.sendToTarget();
diff --git a/src/com/android/phone/NetworkSelectSetting.java b/src/com/android/phone/NetworkSelectSetting.java
index 56f0187..c8a29ce 100644
--- a/src/com/android/phone/NetworkSelectSetting.java
+++ b/src/com/android/phone/NetworkSelectSetting.java
@@ -21,6 +21,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
+import android.content.pm.PackageManager;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.Handler;
@@ -84,6 +85,7 @@
     private NetworkOperatorPreference mSelectedNetworkOperatorPreference;
     private TelephonyManager mTelephonyManager;
     private List<String> mForbiddenPlmns;
+    private boolean mShow4GForLTE;
 
     private final Runnable mUpdateNetworkOperatorsRunnable = () -> {
         updateNetworkOperatorsPreferenceCategory();
@@ -116,6 +118,15 @@
         mStatusMessagePreference = new Preference(getContext());
         mSelectedNetworkOperatorPreference = null;
         mTelephonyManager = TelephonyManager.from(getContext()).createForSubscriptionId(mSubId);
+        try {
+            Context con = getActivity().createPackageContext("com.android.systemui", 0);
+            int id = con.getResources().getIdentifier("config_show4GForLTE",
+                    "bool", "com.android.systemui");
+            mShow4GForLTE = con.getResources().getBoolean(id);
+        } catch (PackageManager.NameNotFoundException e) {
+            Log.e(TAG, "NameNotFoundException for show4GFotLTE");
+            mShow4GForLTE = false;
+        }
         setRetainInstance(true);
     }
 
@@ -217,7 +228,7 @@
                 ThreadUtils.postOnBackgroundThread(() -> {
                     Message msg = mHandler.obtainMessage(EVENT_SET_NETWORK_SELECTION_MANUALLY_DONE);
                     msg.obj = mTelephonyManager.setNetworkSelectionModeManual(
-                            operatorInfo.getOperatorNumeric(), true /* persistSelection */);
+                            operatorInfo, true /* persistSelection */);
                     msg.sendToTarget();
                 });
 
@@ -268,7 +279,6 @@
                         mSelectedNetworkOperatorPreference.setSummary(R.string.network_connected);
                     } else {
                         if (DBG) logd("manual network selection: failed! ");
-                        updateNetworkSelection();
                         // Set summary as "Couldn't connect" to the selected network.
                         mSelectedNetworkOperatorPreference.setSummary(
                                 R.string.network_could_not_connect);
@@ -393,7 +403,7 @@
         for (int index = 0; index < mCellInfoList.size(); index++) {
             if (!mCellInfoList.get(index).isRegistered()) {
                 NetworkOperatorPreference pref = new NetworkOperatorPreference(
-                        mCellInfoList.get(index), getContext(), mForbiddenPlmns);
+                        mCellInfoList.get(index), getContext(), mForbiddenPlmns, mShow4GForLTE);
                 pref.setKey(CellInfoUtil.getNetworkTitle(mCellInfoList.get(index)));
                 pref.setOrder(index);
                 mNetworkOperatorsPreferences.addPreference(pref);
@@ -431,8 +441,8 @@
             CellInfo cellInfo = CellInfoUtil.wrapCellInfoWithCellIdentity(cellIdentity);
             if (cellInfo != null) {
                 if (DBG) logd("Currently registered cell: " + cellInfo.toString());
-                NetworkOperatorPreference pref =
-                        new NetworkOperatorPreference(cellInfo, getContext(), mForbiddenPlmns);
+                NetworkOperatorPreference pref = new NetworkOperatorPreference(
+                        cellInfo, getContext(), mForbiddenPlmns, mShow4GForLTE);
                 pref.setTitle(mTelephonyManager.getNetworkOperatorName());
                 pref.setSummary(R.string.network_connected);
                 // Update the signal strength icon, since the default signalStrength value would be
@@ -512,8 +522,8 @@
         if (DBG) logd("addConnectedNetworkOperatorPreference");
         // Remove the current ConnectedNetworkOperatorsPreference
         removeConnectedNetworkOperatorPreference();
-        final NetworkOperatorPreference pref =
-                new NetworkOperatorPreference(cellInfo, getContext(), mForbiddenPlmns);
+        final NetworkOperatorPreference pref = new NetworkOperatorPreference(
+                cellInfo, getContext(), mForbiddenPlmns, mShow4GForLTE);
         pref.setSummary(R.string.network_connected);
         mConnectedNetworkOperatorsPreference.addPreference(pref);
         PreferenceScreen preferenceScreen = getPreferenceScreen();
@@ -617,21 +627,6 @@
         }
     }
 
-    /**
-     * Call {@link NotificationMgr#updateNetworkSelection(int, int)} to send notification about
-     * no service of user selected operator
-     */
-    private void updateNetworkSelection() {
-        if (DBG) logd("Update notification about no service of user selected operator");
-        final PhoneGlobals app = PhoneGlobals.getInstance();
-        if (SubscriptionManager.isValidSubscriptionId(mSubId)) {
-            ServiceState ss = mTelephonyManager.getServiceState();
-            if (ss != null) {
-                app.notificationMgr.updateNetworkSelection(ss.getState(), mSubId);
-            }
-        }
-    }
-
     private void stopNetworkQuery() {
         // Stop the network query process
         try {
diff --git a/src/com/android/phone/NotificationMgr.java b/src/com/android/phone/NotificationMgr.java
index 1b2d49e..5aa87d0 100644
--- a/src/com/android/phone/NotificationMgr.java
+++ b/src/com/android/phone/NotificationMgr.java
@@ -569,6 +569,9 @@
     private void showNetworkSelection(String operator, int subId) {
         if (DBG) log("showNetworkSelection(" + operator + ")...");
 
+        if (!TextUtils.isEmpty(operator)) {
+            operator = String.format(" (%s)", operator);
+        }
         Notification.Builder builder = new Notification.Builder(mContext)
                 .setSmallIcon(android.R.drawable.stat_sys_warning)
                 .setContentTitle(mContext.getString(R.string.notification_network_selection_title))
diff --git a/src/com/android/phone/PhoneGlobals.java b/src/com/android/phone/PhoneGlobals.java
index b1e061f..67ec932 100644
--- a/src/com/android/phone/PhoneGlobals.java
+++ b/src/com/android/phone/PhoneGlobals.java
@@ -41,6 +41,7 @@
 import android.os.UserManager;
 import android.preference.PreferenceManager;
 import android.provider.Settings;
+import android.telecom.TelecomManager;
 import android.telephony.CarrierConfigManager;
 import android.telephony.ServiceState;
 import android.telephony.SubscriptionManager;
@@ -665,7 +666,9 @@
         if (isAirplaneNewlyOn) {
             // If we are trying to turn off the radio, make sure there are no active
             // emergency calls.  If there are, switch airplane mode back to off.
-            if (PhoneUtils.isInEmergencyCall(mCM)) {
+            TelecomManager tm = (TelecomManager) context.getSystemService(TELECOM_SERVICE);
+
+            if (tm != null && tm.isInEmergencyCall()) {
                 // Switch airplane mode back to off.
                 ConnectivityManager.from(this).setAirplaneMode(false);
                 Toast.makeText(this, R.string.radio_off_during_emergency_call, Toast.LENGTH_LONG)
@@ -862,6 +865,20 @@
     }
 
     /**
+     * Called when the network selection on the subscription {@code subId} is changed by the user.
+     *
+     * @param subId the subscription id.
+     */
+    public void onNetworkSelectionChanged(int subId) {
+        Phone phone = getPhone(subId);
+        if (phone != null) {
+            notificationMgr.updateNetworkSelection(phone.getServiceState().getState(), subId);
+        } else {
+            Log.w(LOG_TAG, "onNetworkSelectionChanged on null phone, subId: " + subId);
+        }
+    }
+
+    /**
      * Dismisses the message waiting (voicemail) indicator.
      *
      * @param subId the subscription id we should dismiss the notification for.
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 0cb4a56..353f4b5 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -57,6 +57,7 @@
 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;
@@ -75,6 +76,8 @@
 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.IImsConfig;
 import android.telephony.ims.aidl.IImsMmTelFeature;
 import android.telephony.ims.aidl.IImsRcsFeature;
@@ -82,7 +85,6 @@
 import android.telephony.ims.stub.ImsRegistrationImplBase;
 import android.text.TextUtils;
 import android.util.ArraySet;
-import android.util.EventLog;
 import android.util.Log;
 import android.util.Pair;
 import android.util.Slog;
@@ -148,8 +150,6 @@
 
     // Message codes used with mMainThreadHandler
     private static final int CMD_HANDLE_PIN_MMI = 1;
-    private static final int CMD_ANSWER_RINGING_CALL = 4;
-    private static final int CMD_END_CALL = 5;  // not used yet
     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;
@@ -203,6 +203,10 @@
     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;
@@ -376,41 +380,6 @@
                     break;
                 }
 
-                case CMD_ANSWER_RINGING_CALL:
-                    request = (MainThreadRequest) msg.obj;
-                    int answer_subId = request.subId;
-                    answerRingingCallInternal(answer_subId);
-                    request.result = ""; // dummy result for notifying the waiting thread
-                    // Wake up the requesting thread
-                    notifyRequester(request);
-                    break;
-
-                case CMD_END_CALL:
-                    request = (MainThreadRequest) msg.obj;
-                    int end_subId = request.subId;
-                    final boolean hungUp;
-                    Phone phone = getPhone(end_subId);
-                    if (phone == null) {
-                        if (DBG) log("CMD_END_CALL: no phone for id: " + end_subId);
-                        break;
-                    }
-                    int phoneType = phone.getPhoneType();
-                    if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
-                        // CDMA: If the user presses the Power button we treat it as
-                        // ending the complete call session
-                        hungUp = PhoneUtils.hangupRingingAndActive(getPhone(end_subId));
-                    } else if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {
-                        // GSM: End the call as per the Phone state
-                        hungUp = PhoneUtils.hangup(mCM);
-                    } else {
-                        throw new IllegalStateException("Unexpected phone type: " + phoneType);
-                    }
-                    if (DBG) log("CMD_END_CALL: " + (hungUp ? "hung up!" : "no call to hang up"));
-                    request.result = hungUp;
-                    // Wake up the requesting thread
-                    notifyRequester(request);
-                    break;
-
                 case CMD_TRANSMIT_APDU_LOGICAL_CHANNEL:
                     request = (MainThreadRequest) msg.obj;
                     iccArgument = (IccAPDUArgument) request.argument;
@@ -795,7 +764,16 @@
                     break;
 
                 case EVENT_SET_NETWORK_SELECTION_MODE_MANUAL_DONE:
-                    handleNullReturnEvent(msg, "setNetworkSelectionModeManual");
+                    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:
@@ -1002,6 +980,47 @@
                     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;
+                    request.result = (ar.exception == 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;
@@ -1159,9 +1178,6 @@
     private Phone getPhone(int subId) {
         return PhoneFactory.getPhone(mSubscriptionController.getPhoneId(subId));
     }
-    //
-    // Implementation of the ITelephony interface.
-    //
 
     public void dial(String number) {
         dialForSubscriber(getPreferredVoiceSubscription(), number);
@@ -1244,7 +1260,7 @@
      * @return true is a call was ended
      */
     public boolean endCall() {
-        return endCallForSubscriber(getDefaultSubscription());
+        return false;
     }
 
     /**
@@ -1252,75 +1268,15 @@
      * @return true is a call was ended
      */
     public boolean endCallForSubscriber(int subId) {
-        if (mApp.checkCallingOrSelfPermission(permission.MODIFY_PHONE_STATE)
-                != PackageManager.PERMISSION_GRANTED) {
-            Log.i(LOG_TAG, "endCall: called without modify phone state.");
-            EventLog.writeEvent(0x534e4554, "67862398", -1, "");
-            throw new SecurityException("MODIFY_PHONE_STATE permission required.");
-        }
-        final long identity = Binder.clearCallingIdentity();
-        try {
-            return (Boolean) sendRequest(CMD_END_CALL, null, new Integer(subId));
-        } finally {
-            Binder.restoreCallingIdentity(identity);
-        }
+        return false;
     }
 
     public void answerRingingCall() {
-        answerRingingCallForSubscriber(getDefaultSubscription());
+        // Deprecated.
     }
 
     public void answerRingingCallForSubscriber(int subId) {
-        if (DBG) log("answerRingingCall...");
-        // TODO: there should eventually be a separate "ANSWER_PHONE" permission,
-        // but that can probably wait till the big TelephonyManager API overhaul.
-        // For now, protect this call with the MODIFY_PHONE_STATE permission.
-        enforceModifyPermission();
-
-        final long identity = Binder.clearCallingIdentity();
-        try {
-            sendRequest(CMD_ANSWER_RINGING_CALL, null, new Integer(subId));
-        } finally {
-            Binder.restoreCallingIdentity(identity);
-        }
-    }
-
-    /**
-     * Make the actual telephony calls to implement answerRingingCall().
-     * This should only be called from the main thread of the Phone app.
-     * @see #answerRingingCall
-     *
-     * TODO: it would be nice to return true if we answered the call, or
-     * false if there wasn't actually a ringing incoming call, or some
-     * other error occurred.  (In other words, pass back the return value
-     * from PhoneUtils.answerCall() or PhoneUtils.answerAndEndActive().)
-     * But that would require calling this method via sendRequest() rather
-     * than sendRequestAsync(), and right now we don't actually *need* that
-     * return value, so let's just return void for now.
-     */
-    private void answerRingingCallInternal(int subId) {
-        final boolean hasRingingCall = !getPhone(subId).getRingingCall().isIdle();
-        if (hasRingingCall) {
-            final boolean hasActiveCall = !getPhone(subId).getForegroundCall().isIdle();
-            final boolean hasHoldingCall = !getPhone(subId).getBackgroundCall().isIdle();
-            if (hasActiveCall && hasHoldingCall) {
-                // Both lines are in use!
-                // TODO: provide a flag to let the caller specify what
-                // policy to use if both lines are in use.  (The current
-                // behavior is hardwired to "answer incoming, end ongoing",
-                // which is how the CALL button is specced to behave.)
-                PhoneUtils.answerAndEndActive(mCM, mCM.getFirstActiveRingingCall());
-                return;
-            } else {
-                // answerCall() will automatically hold the current active
-                // call, if there is one.
-                PhoneUtils.answerCall(mCM.getFirstActiveRingingCall());
-                return;
-            }
-        } else {
-            // No call was ringing.
-            return;
-        }
+        // Deprecated
     }
 
     /**
@@ -1875,12 +1831,9 @@
         try {
             if (DBG_LOC) log("getCellLocation: is active user");
             Bundle data = new Bundle();
-            Phone phone = getPhone(mSubscriptionController.getDefaultDataSubId());
-            if (phone == null) {
-                return null;
-            }
-
-            phone.getCellLocation(workSource).fillInNotifierBundle(data);
+            int subId = mSubscriptionController.getDefaultDataSubId();
+            CellLocation cl = (CellLocation) sendRequest(CMD_GET_CELL_LOCATION, workSource, subId);
+            cl.fillInNotifierBundle(data);
             return data;
         } finally {
             Binder.restoreCallingIdentity(identity);
@@ -2004,7 +1957,9 @@
         try {
             List<CellInfo> cellInfos = new ArrayList<CellInfo>();
             for (Phone phone : PhoneFactory.getPhones()) {
-                final List<CellInfo> info = phone.getAllCellInfo(workSource);
+                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;
@@ -2635,6 +2590,10 @@
 
     @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);
     }
 
@@ -2796,6 +2755,10 @@
         return mSubscriptionController.getDefaultVoiceSubId();
     }
 
+    private boolean isActiveSubscription(int subId) {
+        return mSubscriptionController.isActiveSubId(subId);
+    }
+
     /**
      * @see android.telephony.TelephonyManager.WifiCallingChoices
      */
@@ -3336,6 +3299,10 @@
         TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(
                 mApp, subId, "setNetworkSelectionModeAutomatic");
 
+        if (!isActiveSubscription(subId)) {
+            return;
+        }
+
         final long identity = Binder.clearCallingIdentity();
         try {
             if (DBG) log("setNetworkSelectionModeAutomatic: subId " + subId);
@@ -3345,24 +3312,35 @@
         }
     }
 
-    /**
-     * Set the network selection mode to manual with the selected carrier.
+   /**
+     * 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, String operatorNumeric,
-            boolean persistSelection) {
+    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 {
-            OperatorInfo operator = new OperatorInfo(
-                /* operatorAlphaLong */ "",
-                /* operatorAlphaShort */ "",
-                    operatorNumeric);
-            if (DBG) log("setNetworkSelectionModeManual: subId:" + subId + " operator:" + operator);
-            ManualNetworkSelectionArgument arg = new ManualNetworkSelectionArgument(operator,
+            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);
diff --git a/src/com/android/phone/PhoneUtils.java b/src/com/android/phone/PhoneUtils.java
index 712b8cb..9ede914 100644
--- a/src/com/android/phone/PhoneUtils.java
+++ b/src/com/android/phone/PhoneUtils.java
@@ -19,7 +19,6 @@
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.app.ProgressDialog;
-import android.bluetooth.IBluetoothHeadsetPhone;
 import android.content.ActivityNotFoundException;
 import android.content.ComponentName;
 import android.content.Context;
@@ -30,7 +29,6 @@
 import android.net.Uri;
 import android.os.Handler;
 import android.os.Message;
-import android.os.RemoteException;
 import android.telecom.PhoneAccount;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.VideoProfile;
@@ -106,9 +104,6 @@
     /** Phone state changed event*/
     private static final int PHONE_STATE_CHANGED = -1;
 
-    /** check status then decide whether answerCall */
-    private static final int MSG_CHECK_STATUS_ANSWERCALL = 100;
-
     /** poll phone DISCONNECTING status interval */
     private static final int DISCONNECTING_POLLING_INTERVAL_MS = 200;
 
@@ -125,15 +120,6 @@
      */
     private static final int THEME = com.android.internal.R.style.Theme_DeviceDefault_Dialog_Alert;
 
-    private static class FgRingCalls {
-        private Call fgCall;
-        private Call ringing;
-        public FgRingCalls(Call fg, Call ring) {
-            fgCall = fg;
-            ringing = ring;
-        }
-    }
-
     /** USSD information used to aggregate all USSD messages */
     private static AlertDialog sUssdDialog = null;
     private static StringBuilder sUssdMsg = new StringBuilder();
@@ -147,34 +133,6 @@
      * Mute settings for each connection as needed.
      */
     private static class ConnectionHandler extends Handler {
-        @Override
-        public void handleMessage(Message msg) {
-            switch (msg.what) {
-                case MSG_CHECK_STATUS_ANSWERCALL:
-                    FgRingCalls frC = (FgRingCalls) msg.obj;
-                    // wait for finishing disconnecting
-                    // before check the ringing call state
-                    if ((frC.fgCall != null) &&
-                        (frC.fgCall.getState() == Call.State.DISCONNECTING) &&
-                        (msg.arg1 < DISCONNECTING_POLLING_TIMES_LIMIT)) {
-                        Message retryMsg =
-                            mConnectionHandler.obtainMessage(MSG_CHECK_STATUS_ANSWERCALL);
-                        retryMsg.arg1 = 1 + msg.arg1;
-                        retryMsg.obj = msg.obj;
-                        mConnectionHandler.sendMessageDelayed(retryMsg,
-                            DISCONNECTING_POLLING_INTERVAL_MS);
-                    // since hangupActiveCall() also accepts the ringing call
-                    // check if the ringing call was already answered or not
-                    // only answer it when the call still is ringing
-                    } else if (frC.ringing.isRinging()) {
-                        if (msg.arg1 == DISCONNECTING_POLLING_TIMES_LIMIT) {
-                            Log.e(LOG_TAG, "DISCONNECTING time out");
-                        }
-                        answerCall(frC.ringing);
-                    }
-                    break;
-            }
-        }
     }
 
     /**
@@ -195,294 +153,6 @@
     }
 
     /**
-     * Answer the currently-ringing call.
-     *
-     * @return true if we answered the call, or false if there wasn't
-     *         actually a ringing incoming call, or some other error occurred.
-     *
-     * @see #answerAndEndHolding(CallManager, Call)
-     * @see #answerAndEndActive(CallManager, Call)
-     */
-    /* package */ static boolean answerCall(Call ringingCall) {
-        log("answerCall(" + ringingCall + ")...");
-        final PhoneGlobals app = PhoneGlobals.getInstance();
-        final CallNotifier notifier = app.notifier;
-
-        final Phone phone = ringingCall.getPhone();
-        final boolean phoneIsCdma = (phone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA);
-        boolean answered = false;
-        IBluetoothHeadsetPhone btPhone = null;
-
-        if (phoneIsCdma) {
-            // Stop any signalInfo tone being played when a Call waiting gets answered
-            if (ringingCall.getState() == Call.State.WAITING) {
-                notifier.stopSignalInfoTone();
-            }
-        }
-
-        if (ringingCall != null && ringingCall.isRinging()) {
-            if (DBG) log("answerCall: call state = " + ringingCall.getState());
-            try {
-                if (phoneIsCdma) {
-                    if (app.cdmaPhoneCallState.getCurrentCallState()
-                            == CdmaPhoneCallState.PhoneCallState.IDLE) {
-                        // This is the FIRST incoming call being answered.
-                        // Set the Phone Call State to SINGLE_ACTIVE
-                        app.cdmaPhoneCallState.setCurrentCallState(
-                                CdmaPhoneCallState.PhoneCallState.SINGLE_ACTIVE);
-                    } else {
-                        // This is the CALL WAITING call being answered.
-                        // Set the Phone Call State to CONF_CALL
-                        app.cdmaPhoneCallState.setCurrentCallState(
-                                CdmaPhoneCallState.PhoneCallState.CONF_CALL);
-                        // Enable "Add Call" option after answering a Call Waiting as the user
-                        // should be allowed to add another call in case one of the parties
-                        // drops off
-                        app.cdmaPhoneCallState.setAddCallMenuStateAfterCallWaiting(true);
-                    }
-                }
-
-                final boolean isRealIncomingCall = isRealIncomingCall(ringingCall.getState());
-
-                //if (DBG) log("sPhone.acceptCall");
-                app.mCM.acceptCall(ringingCall);
-                answered = true;
-
-                setAudioMode();
-            } catch (CallStateException ex) {
-                Log.w(LOG_TAG, "answerCall: caught " + ex, ex);
-
-                if (phoneIsCdma) {
-                    // restore the cdmaPhoneCallState and btPhone.cdmaSetSecondCallState:
-                    app.cdmaPhoneCallState.setCurrentCallState(
-                            app.cdmaPhoneCallState.getPreviousCallState());
-                    if (btPhone != null) {
-                        try {
-                            btPhone.cdmaSetSecondCallState(false);
-                        } catch (RemoteException e) {
-                            Log.e(LOG_TAG, Log.getStackTraceString(new Throwable()));
-                        }
-                    }
-                }
-            }
-        }
-        return answered;
-    }
-
-    /**
-     * Hangs up all active calls.
-     */
-    static void hangupAllCalls(CallManager cm) {
-        final Call ringing = cm.getFirstActiveRingingCall();
-        final Call fg = cm.getActiveFgCall();
-        final Call bg = cm.getFirstActiveBgCall();
-
-        // We go in reverse order, BG->FG->RINGING because hanging up a ringing call or an active
-        // call can move a bg call to a fg call which would force us to loop over each call
-        // several times.  This ordering works best to ensure we dont have any more calls.
-        if (bg != null && !bg.isIdle()) {
-            hangup(bg);
-        }
-        if (fg != null && !fg.isIdle()) {
-            hangup(fg);
-        }
-        if (ringing != null && !ringing.isIdle()) {
-            hangupRingingCall(fg);
-        }
-    }
-
-    /**
-     * Smart "hang up" helper method which hangs up exactly one connection,
-     * based on the current Phone state, as follows:
-     * <ul>
-     * <li>If there's a ringing call, hang that up.
-     * <li>Else if there's a foreground call, hang that up.
-     * <li>Else if there's a background call, hang that up.
-     * <li>Otherwise do nothing.
-     * </ul>
-     * @return true if we successfully hung up, or false
-     *              if there were no active calls at all.
-     */
-    static boolean hangup(CallManager cm) {
-        boolean hungup = false;
-        Call ringing = cm.getFirstActiveRingingCall();
-        Call fg = cm.getActiveFgCall();
-        Call bg = cm.getFirstActiveBgCall();
-
-        if (!ringing.isIdle()) {
-            log("hangup(): hanging up ringing call");
-            hungup = hangupRingingCall(ringing);
-        } else if (!fg.isIdle()) {
-            log("hangup(): hanging up foreground call");
-            hungup = hangup(fg);
-        } else if (!bg.isIdle()) {
-            log("hangup(): hanging up background call");
-            hungup = hangup(bg);
-        } else {
-            // No call to hang up!  This is unlikely in normal usage,
-            // since the UI shouldn't be providing an "End call" button in
-            // the first place.  (But it *can* happen, rarely, if an
-            // active call happens to disconnect on its own right when the
-            // user is trying to hang up..)
-            log("hangup(): no active call to hang up");
-        }
-        if (DBG) log("==> hungup = " + hungup);
-
-        return hungup;
-    }
-
-    static boolean hangupRingingCall(Call ringing) {
-        if (DBG) log("hangup ringing call");
-        int phoneType = ringing.getPhone().getPhoneType();
-        Call.State state = ringing.getState();
-
-        if (state == Call.State.INCOMING) {
-            // Regular incoming call (with no other active calls)
-            log("hangupRingingCall(): regular incoming call: hangup()");
-            return hangup(ringing);
-        } else {
-            // Unexpected state: the ringing call isn't INCOMING or
-            // WAITING, so there's no reason to have called
-            // hangupRingingCall() in the first place.
-            // (Presumably the incoming call went away at the exact moment
-            // we got here, so just do nothing.)
-            Log.w(LOG_TAG, "hangupRingingCall: no INCOMING or WAITING call");
-            return false;
-        }
-    }
-
-    static boolean hangupActiveCall(Call foreground) {
-        if (DBG) log("hangup active call");
-        return hangup(foreground);
-    }
-
-    static boolean hangupHoldingCall(Call background) {
-        if (DBG) log("hangup holding call");
-        return hangup(background);
-    }
-
-    /**
-     * Used in CDMA phones to end the complete Call session
-     * @param phone the Phone object.
-     * @return true if *any* call was successfully hung up
-     */
-    static boolean hangupRingingAndActive(Phone phone) {
-        boolean hungUpRingingCall = false;
-        boolean hungUpFgCall = false;
-        Call ringingCall = phone.getRingingCall();
-        Call fgCall = phone.getForegroundCall();
-
-        // Hang up any Ringing Call
-        if (!ringingCall.isIdle()) {
-            log("hangupRingingAndActive: Hang up Ringing Call");
-            hungUpRingingCall = hangupRingingCall(ringingCall);
-        }
-
-        // Hang up any Active Call
-        if (!fgCall.isIdle()) {
-            log("hangupRingingAndActive: Hang up Foreground Call");
-            hungUpFgCall = hangupActiveCall(fgCall);
-        }
-
-        return hungUpRingingCall || hungUpFgCall;
-    }
-
-    /**
-     * Trivial wrapper around Call.hangup(), except that we return a
-     * boolean success code rather than throwing CallStateException on
-     * failure.
-     *
-     * @return true if the call was successfully hung up, or false
-     *         if the call wasn't actually active.
-     */
-    static boolean hangup(Call call) {
-        try {
-            CallManager cm = PhoneGlobals.getInstance().mCM;
-
-            if (call.getState() == Call.State.ACTIVE && cm.hasActiveBgCall()) {
-                // handle foreground call hangup while there is background call
-                log("- hangup(Call): hangupForegroundResumeBackground...");
-                cm.hangupForegroundResumeBackground(cm.getFirstActiveBgCall());
-            } else {
-                log("- hangup(Call): regular hangup()...");
-                call.hangup();
-            }
-            return true;
-        } catch (CallStateException ex) {
-            Log.e(LOG_TAG, "Call hangup: caught " + ex, ex);
-        }
-
-        return false;
-    }
-
-    /**
-     * Trivial wrapper around Connection.hangup(), except that we silently
-     * do nothing (rather than throwing CallStateException) if the
-     * connection wasn't actually active.
-     */
-    static void hangup(Connection c) {
-        try {
-            if (c != null) {
-                c.hangup();
-            }
-        } catch (CallStateException ex) {
-            Log.w(LOG_TAG, "Connection hangup: caught " + ex, ex);
-        }
-    }
-
-    static boolean answerAndEndHolding(CallManager cm, Call ringing) {
-        if (DBG) log("end holding & answer waiting: 1");
-        if (!hangupHoldingCall(cm.getFirstActiveBgCall())) {
-            Log.e(LOG_TAG, "end holding failed!");
-            return false;
-        }
-
-        if (DBG) log("end holding & answer waiting: 2");
-        return answerCall(ringing);
-
-    }
-
-    /**
-     * Answers the incoming call specified by "ringing", and ends the currently active phone call.
-     *
-     * This method is useful when's there's an incoming call which we cannot manage with the
-     * current call. e.g. when you are having a phone call with CDMA network and has received
-     * a SIP call, then we won't expect our telephony can manage those phone calls simultaneously.
-     * Note that some types of network may allow multiple phone calls at once; GSM allows to hold
-     * an ongoing phone call, so we don't need to end the active call. The caller of this method
-     * needs to check if the network allows multiple phone calls or not.
-     *
-     * @see #answerCall(Call)
-     * @see InCallScreen#internalAnswerCall()
-     */
-    /* package */ static boolean answerAndEndActive(CallManager cm, Call ringing) {
-        if (DBG) log("answerAndEndActive()...");
-
-        // Unlike the answerCall() method, we *don't* need to stop the
-        // ringer or change audio modes here since the user is already
-        // in-call, which means that the audio mode is already set
-        // correctly, and that we wouldn't have started the ringer in the
-        // first place.
-
-        // hanging up the active call also accepts the waiting call
-        // while active call and waiting call are from the same phone
-        // i.e. both from GSM phone
-        Call fgCall = cm.getActiveFgCall();
-        if (!hangupActiveCall(fgCall)) {
-            Log.w(LOG_TAG, "end active call failed!");
-            return false;
-        }
-
-        mConnectionHandler.removeMessages(MSG_CHECK_STATUS_ANSWERCALL);
-        Message msg = mConnectionHandler.obtainMessage(MSG_CHECK_STATUS_ANSWERCALL);
-        msg.arg1 = 1;
-        msg.obj = new FgRingCalls(fgCall, ringing);
-        mConnectionHandler.sendMessage(msg);
-
-        return true;
-    }
-
-    /**
      * For a CDMA phone, advance the call state upon making a new
      * outgoing call.
      *
@@ -676,87 +346,6 @@
         return builder.toString();
     }
 
-    /**
-     * Wrapper function to control when to send an empty Flash command to the network.
-     * Mainly needed for CDMA networks, such as scenarios when we need to send a blank flash
-     * to the network prior to placing a 3-way call for it to be successful.
-     */
-    static void sendEmptyFlash(Phone phone) {
-        if (phone.getPhoneType() == PhoneConstants.PHONE_TYPE_CDMA) {
-            Call fgCall = phone.getForegroundCall();
-            if (fgCall.getState() == Call.State.ACTIVE) {
-                // Send the empty flash
-                if (DBG) Log.d(LOG_TAG, "onReceive: (CDMA) sending empty flash to network");
-                switchHoldingAndActive(phone.getBackgroundCall());
-            }
-        }
-    }
-
-    static void swap() {
-        final PhoneGlobals mApp = PhoneGlobals.getInstance();
-        if (!okToSwapCalls(mApp.mCM)) {
-            // TODO: throw an error instead?
-            return;
-        }
-
-        // Swap the fg and bg calls.
-        // In the future we may provide some way for user to choose among
-        // multiple background calls, for now, always act on the first background call.
-        PhoneUtils.switchHoldingAndActive(mApp.mCM.getFirstActiveBgCall());
-    }
-
-    /**
-     * @param heldCall is the background call want to be swapped
-     */
-    static void switchHoldingAndActive(Call heldCall) {
-        log("switchHoldingAndActive()...");
-        try {
-            CallManager cm = PhoneGlobals.getInstance().mCM;
-            if (heldCall.isIdle()) {
-                // no heldCall, so it is to hold active call
-                cm.switchHoldingAndActive(cm.getFgPhone().getBackgroundCall());
-            } else {
-                // has particular heldCall, so to switch
-                cm.switchHoldingAndActive(heldCall);
-            }
-            setAudioMode(cm);
-        } catch (CallStateException ex) {
-            Log.w(LOG_TAG, "switchHoldingAndActive: caught " + ex, ex);
-        }
-    }
-
-    static void mergeCalls() {
-        mergeCalls(PhoneGlobals.getInstance().mCM);
-    }
-
-    static void mergeCalls(CallManager cm) {
-        int phoneType = cm.getFgPhone().getPhoneType();
-        if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
-            log("mergeCalls(): CDMA...");
-            PhoneGlobals app = PhoneGlobals.getInstance();
-            if (app.cdmaPhoneCallState.getCurrentCallState()
-                    == CdmaPhoneCallState.PhoneCallState.THRWAY_ACTIVE) {
-                // Set the Phone Call State to conference
-                app.cdmaPhoneCallState.setCurrentCallState(
-                        CdmaPhoneCallState.PhoneCallState.CONF_CALL);
-
-                // Send flash cmd
-                // TODO: Need to change the call from switchHoldingAndActive to
-                // something meaningful as we are not actually trying to swap calls but
-                // instead are merging two calls by sending a Flash command.
-                log("- sending flash...");
-                switchHoldingAndActive(cm.getFirstActiveBgCall());
-            }
-        } else {
-            try {
-                log("mergeCalls(): calling cm.conference()...");
-                cm.conference(cm.getFirstActiveBgCall());
-            } catch (CallStateException ex) {
-                Log.w(LOG_TAG, "mergeCalls: caught " + ex, ex);
-            }
-        }
-    }
-
     static void separateCall(Connection c) {
         try {
             if (DBG) log("separateCall: " + toLogSafePhoneNumber(c.getAddress()));
@@ -1741,20 +1330,6 @@
         return audioManager.isSpeakerphoneOn();
     }
 
-    static boolean isInEmergencyCall(CallManager cm) {
-        Call fgCall = cm.getActiveFgCall();
-        // isIdle includes checks for the DISCONNECTING/DISCONNECTED state.
-        if(!fgCall.isIdle()) {
-            for (Connection cn : fgCall.getConnections()) {
-                if (PhoneNumberUtils.isLocalEmergencyNumber(PhoneGlobals.getInstance(),
-                        cn.getAddress())) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
     /**
      * Get the mute state of foreground phone, which has the current
      * foreground call
diff --git a/src/com/android/phone/RoamingDialogFragment.java b/src/com/android/phone/RoamingDialogFragment.java
index d24967b..384a120 100644
--- a/src/com/android/phone/RoamingDialogFragment.java
+++ b/src/com/android/phone/RoamingDialogFragment.java
@@ -35,6 +35,7 @@
 
     public static final String SUB_ID_KEY = "sub_id_key";
 
+    private CarrierConfigManager mCarrierConfigManager;
     private int mSubId;
 
     /**
@@ -52,6 +53,7 @@
         super.onAttach(context);
         Bundle args = getArguments();
         mSubId = args.getInt(SUB_ID_KEY);
+        mCarrierConfigManager = new CarrierConfigManager(context);
 
         // Verify host activity implemented callback interface
         FragmentManager fragmentManager = getFragmentManager();
@@ -68,8 +70,7 @@
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
         int title = R.string.roaming_alert_title;
-        PersistableBundle carrierConfig =
-                PhoneGlobals.getInstance().getCarrierConfigForSubId(mSubId);
+        PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
         if (carrierConfig != null && carrierConfig.getBoolean(
                 CarrierConfigManager.KEY_CHECK_PRICING_WITH_CARRIER_FOR_DATA_ROAMING_BOOL)) {
             title = R.string.roaming_check_price_warning;
diff --git a/src/com/android/phone/settings/VoicemailProviderSettingsUtil.java b/src/com/android/phone/settings/VoicemailProviderSettingsUtil.java
index 8187664..3ccd4a3 100644
--- a/src/com/android/phone/settings/VoicemailProviderSettingsUtil.java
+++ b/src/com/android/phone/settings/VoicemailProviderSettingsUtil.java
@@ -137,7 +137,7 @@
         prefs.edit()
                 .putString(key + VM_NUMBER_TAG, null)
                 .putInt(key + FWD_SETTINGS_TAG + FWD_SETTINGS_LENGTH_TAG, 0)
-                .commit();
+                .apply();
     }
 
     private static SharedPreferences getPrefs(Context context) {
diff --git a/src/com/android/services/telephony/CdmaConferenceController.java b/src/com/android/services/telephony/CdmaConferenceController.java
index 24c3870..5d987f7 100644
--- a/src/com/android/services/telephony/CdmaConferenceController.java
+++ b/src/com/android/services/telephony/CdmaConferenceController.java
@@ -211,6 +211,7 @@
             // 4) Add the conference to the connection service if it is new.
             if (isNewlyCreated) {
                 Log.d(this, "Adding the conference call");
+                mConference.updateCallRadioTechAfterCreation();
                 mConnectionService.addConference(mConference);
             }
         } else if (conferenceConnections.isEmpty()) {
diff --git a/src/com/android/services/telephony/ImsConference.java b/src/com/android/services/telephony/ImsConference.java
index b196d57..5722834 100644
--- a/src/com/android/services/telephony/ImsConference.java
+++ b/src/com/android/services/telephony/ImsConference.java
@@ -640,6 +640,7 @@
 
         setState(mConferenceHost.getState());
         updateStatusHints();
+        putExtras(mConferenceHost.getExtras());
     }
 
     /**
diff --git a/src/com/android/services/telephony/TelephonyConferenceController.java b/src/com/android/services/telephony/TelephonyConferenceController.java
index e96815c..e9eef46 100644
--- a/src/com/android/services/telephony/TelephonyConferenceController.java
+++ b/src/com/android/services/telephony/TelephonyConferenceController.java
@@ -264,6 +264,7 @@
                                 mTelephonyConference, connection);
                         mTelephonyConference.addConnection(connection);
                     }
+                    mTelephonyConference.updateCallRadioTechAfterCreation();
                     mConnectionService.addConference(mTelephonyConference);
                 } else {
                     Log.d(this, "Trigger recalculate later");
diff --git a/src/com/android/services/telephony/TelephonyConnection.java b/src/com/android/services/telephony/TelephonyConnection.java
index 4c1963f..3192c75 100644
--- a/src/com/android/services/telephony/TelephonyConnection.java
+++ b/src/com/android/services/telephony/TelephonyConnection.java
@@ -36,6 +36,7 @@
 import android.telephony.CarrierConfigManager;
 import android.telephony.DisconnectCause;
 import android.telephony.PhoneNumberUtils;
+import android.telephony.ServiceState;
 import android.telephony.TelephonyManager;
 import android.telephony.ims.ImsCallProfile;
 import android.text.TextUtils;
@@ -96,6 +97,7 @@
     private static final int MSG_CDMA_VOICE_PRIVACY_ON = 15;
     private static final int MSG_CDMA_VOICE_PRIVACY_OFF = 16;
     private static final int MSG_HANGUP = 17;
+    private static final int MSG_SET_CALL_RADIO_TECH = 18;
 
     private final Handler mHandler = new Handler(Looper.getMainLooper()) {
         @Override
@@ -240,6 +242,31 @@
                     int cause = (int) msg.obj;
                     hangup(cause);
                     break;
+
+                case MSG_SET_CALL_RADIO_TECH:
+                    int vrat = (int) msg.obj;
+                    // Check whether Wi-Fi call tech is changed, it means call radio tech is:
+                    //  a) changed from IWLAN to other value, or
+                    //  b) changed from other value to IWLAN.
+                    //
+                    // In other word, below conditions are all met:
+                    // 1) {@link #getCallRadioTech} is different from new vrat
+                    // 2) Current call radio technology indicates Wi-Fi call, i.e. {@link #isWifi}
+                    //    is true, or new vrat indicates Wi-Fi call.
+                    boolean isWifiTechChange = getCallRadioTech() != vrat
+                            && (isWifi() || vrat == ServiceState.RIL_RADIO_TECHNOLOGY_IWLAN);
+
+                    // Step 1) Updates call radio tech firstly, so that afterwards Wi-Fi related
+                    // update actions are taken correctly.
+                    setCallRadioTech(vrat);
+
+                    // Step 2) Handles Wi-Fi call tech change.
+                    if (isWifiTechChange) {
+                        updateConnectionProperties();
+                        updateStatusHints();
+                        refreshDisableAddCall();
+                    }
+                    break;
             }
         }
     };
@@ -421,14 +448,14 @@
         }
 
         /**
-         * Used by {@link com.android.internal.telephony.Connection} to report a change in whether
-         * the call is being made over a wifi network.
+         * Used by {@link com.android.internal.telephony.Connection} to report a change for
+         * the call radio technology.
          *
-         * @param isWifi True if call is made over wifi.
+         * @param vrat the RIL Voice Radio Technology used for current connection.
          */
         @Override
-        public void onWifiChanged(boolean isWifi) {
-            setWifi(isWifi);
+        public void onCallRadioTechChanged(@ServiceState.RilRadioTechnology int vrat) {
+            mHandler.obtainMessage(MSG_SET_CALL_RADIO_TECH, vrat).sendToTarget();
         }
 
         /**
@@ -575,6 +602,11 @@
                 com.android.internal.telephony.Connection newConnection) {
             setOriginalConnection(newConnection);
         }
+
+        @Override
+        public void onIsNetworkEmergencyCallChanged(boolean isEmergencyCall) {
+            setIsNetworkIdentifiedEmergencyCall(isEmergencyCall);
+        }
     };
 
     protected com.android.internal.telephony.Connection mOriginalConnection;
@@ -599,13 +631,6 @@
     private int mOriginalConnectionCapabilities;
 
     /**
-     * Determines if the {@link TelephonyConnection} is using wifi.
-     * This is used when {@link TelephonyConnection#updateConnectionProperties()} is called to
-     * indicate whether a call has the {@link Connection#PROPERTY_WIFI} property.
-     */
-    private boolean mIsWifi;
-
-    /**
      * Determines the audio quality is high for the {@link TelephonyConnection}.
      * This is used when {@link TelephonyConnection#updateConnectionProperties}} is called to
      * indicate whether a call has the {@link Connection#PROPERTY_HIGH_DEF_AUDIO} property.
@@ -620,6 +645,15 @@
     private boolean mTreatAsEmergencyCall;
 
     /**
+     * Indicates whether the network has identified this call as an emergency call.  Where
+     * {@link #mTreatAsEmergencyCall} is based on comparing dialed numbers to a list of known
+     * emergency numbers, this property is based on whether the network itself has identified the
+     * call as an emergency call (which can be the case for an incoming call from emergency
+     * services).
+     */
+    private boolean mIsNetworkIdentifiedEmergencyCall;
+
+    /**
      * For video calls, indicates whether the outgoing video for the call can be paused using
      * the {@link android.telecom.VideoProfile#STATE_PAUSED} VideoState.
      */
@@ -888,6 +922,13 @@
             Log.v(this, "Holding active call");
             try {
                 Phone phone = mOriginalConnection.getCall().getPhone();
+
+                // New behavior for IMS -- don't use the clunky switchHoldingAndActive logic.
+                if (phone.getPhoneType() == PhoneConstants.PHONE_TYPE_IMS) {
+                    ImsPhone imsPhone = (ImsPhone) phone;
+                    imsPhone.holdActiveCall();
+                    return;
+                }
                 Call ringingCall = phone.getRingingCall();
 
                 // Although the method says switchHoldingAndActive, it eventually calls a RIL method
@@ -917,6 +958,13 @@
         Log.v(this, "performUnhold");
         if (Call.State.HOLDING == mConnectionState) {
             try {
+                Phone phone = mOriginalConnection.getCall().getPhone();
+                // New behavior for IMS -- don't use the clunky switchHoldingAndActive logic.
+                if (phone.getPhoneType() == PhoneConstants.PHONE_TYPE_IMS) {
+                    ImsPhone imsPhone = (ImsPhone) phone;
+                    imsPhone.unholdHeldCall();
+                    return;
+                }
                 // Here's the deal--Telephony hold/unhold is weird because whenever there exists
                 // more than one call, one of them must always be active. In other words, if you
                 // have an active call and holding call, and you put the active call on hold, it
@@ -1021,7 +1069,7 @@
 
         newProperties = changeBitmask(newProperties, PROPERTY_HIGH_DEF_AUDIO,
                 hasHighDefAudioProperty());
-        newProperties = changeBitmask(newProperties, PROPERTY_WIFI, mIsWifi);
+        newProperties = changeBitmask(newProperties, PROPERTY_WIFI, isWifi());
         newProperties = changeBitmask(newProperties, PROPERTY_IS_EXTERNAL_CALL,
                 isExternalConnection());
         newProperties = changeBitmask(newProperties, PROPERTY_HAS_CDMA_VOICE_PRIVACY,
@@ -1029,6 +1077,8 @@
         newProperties = changeBitmask(newProperties, PROPERTY_ASSISTED_DIALING_USED,
                 mIsUsingAssistedDialing);
         newProperties = changeBitmask(newProperties, PROPERTY_IS_RTT, isRtt());
+        newProperties = changeBitmask(newProperties, PROPERTY_NETWORK_IDENTIFIED_EMERGENCY_CALL,
+                isNetworkIdentifiedEmergencyCall());
 
         if (getConnectionProperties() != newProperties) {
             setConnectionProperties(newProperties);
@@ -1108,12 +1158,14 @@
         // Set video state and capabilities
         setVideoState(mOriginalConnection.getVideoState());
         setOriginalConnectionCapabilities(mOriginalConnection.getConnectionCapabilities());
-        setWifi(mOriginalConnection.isWifi());
+        setIsNetworkIdentifiedEmergencyCall(mOriginalConnection.isNetworkIdentifiedEmergencyCall());
         setAudioModeIsVoip(mOriginalConnection.getAudioModeIsVoip());
         setVideoProvider(mOriginalConnection.getVideoProvider());
         setAudioQuality(mOriginalConnection.getAudioQuality());
         setTechnologyTypeExtra();
 
+        setCallRadioTech(mOriginalConnection.getCallRadioTech());
+
         // Post update of extras to the handler; extras are updated via the handler to ensure thread
         // safety. The Extras Bundle is cloned in case the original extras are modified while they
         // are being added to mOriginalConnectionExtras in updateExtras.
@@ -1230,7 +1282,7 @@
 
         if (isCurrentVideoCall) {
             return true;
-        } else if (wasVideoCall && mIsWifi && !isVowifiEnabled) {
+        } else if (wasVideoCall && isWifi() && !isVowifiEnabled) {
             return true;
         }
         return false;
@@ -1265,7 +1317,7 @@
             return false;
         }
 
-        if (mIsWifi && !canWifiCallsBeHdAudio) {
+        if (isWifi() && !canWifiCallsBeHdAudio) {
             return false;
         }
 
@@ -1824,21 +1876,31 @@
     }
 
     /**
-     * Sets whether the call is using wifi. Used when rebuilding the capabilities to set or unset
-     * the {@link Connection#PROPERTY_WIFI} property.
-     */
-    public void setWifi(boolean isWifi) {
-        mIsWifi = isWifi;
-        updateConnectionProperties();
-        updateStatusHints();
-        refreshDisableAddCall();
-    }
-
-    /**
      * Whether the call is using wifi.
      */
     boolean isWifi() {
-        return mIsWifi;
+        return getCallRadioTech() == ServiceState.RIL_RADIO_TECHNOLOGY_IWLAN;
+    }
+
+    /**
+     * Sets whether this call has been identified by the network as an emergency call.
+     * @param isNetworkIdentifiedEmergencyCall {@code true} if the network has identified this call
+     * as an emergency call, {@code false} otherwise.
+     */
+    public void setIsNetworkIdentifiedEmergencyCall(boolean isNetworkIdentifiedEmergencyCall) {
+        Log.d(this, "setIsNetworkIdentifiedEmergencyCall; callId=%s, "
+                + "isNetworkIdentifiedEmergencyCall=%b", getTelecomCallId(),
+                isNetworkIdentifiedEmergencyCall);
+        mIsNetworkIdentifiedEmergencyCall = isNetworkIdentifiedEmergencyCall;
+        updateConnectionProperties();
+    }
+
+    /**
+     * @return {@code true} if the network has identified this call as an emergency call,
+     * {@code false} otherwise.
+     */
+    public boolean isNetworkIdentifiedEmergencyCall() {
+        return mIsNetworkIdentifiedEmergencyCall;
     }
 
     /**
@@ -2027,7 +2089,7 @@
     }
 
     private void updateStatusHints() {
-        if (mIsWifi && getPhone() != null) {
+        if (isWifi() && getPhone() != null) {
             int labelId = isValidRingingCall()
                     ? R.string.status_hint_label_incoming_wifi_call
                     : R.string.status_hint_label_wifi_call;
diff --git a/src/com/android/services/telephony/TelephonyConnectionService.java b/src/com/android/services/telephony/TelephonyConnectionService.java
index 3aac490..3ec00b9 100644
--- a/src/com/android/services/telephony/TelephonyConnectionService.java
+++ b/src/com/android/services/telephony/TelephonyConnectionService.java
@@ -1037,7 +1037,9 @@
         }
 
         Queue<Phone> cachedPhones = mEmergencyRetryCache.second;
-        Phone phoneUsed = c.getPhone();
+        // Need to refer default phone considering ImsPhone because
+        // cachedPhones is a list that contains default phones.
+        Phone phoneUsed = c.getPhone().getDefaultPhone();
         if (phoneUsed == null) {
             return;
         }
diff --git a/tests/src/com/android/services/telephony/TelephonyConnectionServiceTest.java b/tests/src/com/android/services/telephony/TelephonyConnectionServiceTest.java
index 3bd2716..a18adb8 100644
--- a/tests/src/com/android/services/telephony/TelephonyConnectionServiceTest.java
+++ b/tests/src/com/android/services/telephony/TelephonyConnectionServiceTest.java
@@ -21,7 +21,6 @@
 import static junit.framework.Assert.fail;
 
 import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.mock;
@@ -817,6 +816,7 @@
         testServiceState.setEmergencyOnly(isEmergencyOnly);
         when(phone.getServiceState()).thenReturn(testServiceState);
         when(phone.getPhoneId()).thenReturn(phoneId);
+        when(phone.getDefaultPhone()).thenReturn(phone);
         return phone;
     }
 
diff --git a/tests/src/com/android/services/telephony/TestTelephonyConnection.java b/tests/src/com/android/services/telephony/TestTelephonyConnection.java
index 9040257..39e4579 100644
--- a/tests/src/com/android/services/telephony/TestTelephonyConnection.java
+++ b/tests/src/com/android/services/telephony/TestTelephonyConnection.java
@@ -74,6 +74,7 @@
                 any(Connection.PostDialListener.class));
         when(mMockPhone.getRingingCall()).thenReturn(mMockCall);
         when(mMockPhone.getContext()).thenReturn(null);
+        when(mMockPhone.getDefaultPhone()).thenReturn(mMockPhone);
         when(mMockCall.getState()).thenReturn(Call.State.ACTIVE);
         when(mMockCall.getPhone()).thenReturn(mMockPhone);
     }
@@ -107,6 +108,11 @@
         mLastConnectionEventExtras.add(extras);
     }
 
+    @Override
+    void clearOriginalConnection() {
+        // Do nothing since the original connection is mock object
+    }
+
     public int getNotifyPhoneAccountChangedCount() {
         return mNotifyPhoneAccountChangedCount;
     }