diff --git a/src/com/android/phone/PhoneUtils.java b/src/com/android/phone/PhoneUtils.java
index 9f70349..6fdff14 100644
--- a/src/com/android/phone/PhoneUtils.java
+++ b/src/com/android/phone/PhoneUtils.java
@@ -86,9 +86,9 @@
     static final String ADD_CALL_MODE_KEY = "add_call_mode";
 
     // Return codes from placeCall()
-    static final int CALL_STATUS_DIALED = 0;  // The number was successfully dialed
-    static final int CALL_STATUS_DIALED_MMI = 1;  // The specified number was an MMI code
-    static final int CALL_STATUS_FAILED = 2;  // The call failed
+    public static final int CALL_STATUS_DIALED = 0;  // The number was successfully dialed
+    public static final int CALL_STATUS_DIALED_MMI = 1;  // The specified number was an MMI code
+    public static final int CALL_STATUS_FAILED = 2;  // The call failed
 
     // State of the Phone's audio modes
     // Each state can move to the other states, but within the state only certain
diff --git a/src/com/android/phone/otasp/OtaspActivationService.java b/src/com/android/phone/otasp/OtaspActivationService.java
new file mode 100644
index 0000000..504315f
--- /dev/null
+++ b/src/com/android/phone/otasp/OtaspActivationService.java
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2017 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.otasp;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.AsyncResult;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Message;
+import android.telephony.ServiceState;
+
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.PhoneConstants;
+import com.android.phone.PhoneGlobals;
+import com.android.phone.PhoneUtils;
+
+import static com.android.phone.PhoneGlobals.getPhone;
+
+/**
+ * otasp activation service handles all logic related with OTASP call.
+ * OTASP is a CDMA-specific feature: OTA or OTASP == Over The Air service provisioning
+ * In practice, in a normal successful OTASP call, events come in as follows:
+ * - SPL_UNLOCKED within a couple of seconds after the call starts
+ * - PRL_DOWNLOADED and MDN_DOWNLOADED and COMMITTED within a span of 2 seconds
+ * - poll cdma subscription from RIL after COMMITTED
+ * - SIM reloading with provisioned MDN and MIN
+ */
+public class OtaspActivationService extends Service {
+    private static final String TAG = OtaspActivationService.class.getSimpleName();
+    private static final boolean DBG = true;
+    /* non-interactive otasp number */
+    private static final String OTASP_NUMBER = "*22899";
+
+    /**
+     * Otasp call follows with SIM reloading which might triggers a retry loop on activation
+     * failure. A max retry limit could help prevent retry loop.
+     */
+    private static final int OTASP_CALL_RETRIES_MAX = 3;
+    private static final int OTASP_CALL_RETRY_PERIOD_IN_MS = 3000;
+    private static int sOtaspCallRetries = 0;
+
+    /* events */
+    private static final int EVENT_CALL_STATE_CHANGED                     = 0;
+    private static final int EVENT_CDMA_OTASP_CALL_RETRY                  = 1;
+    private static final int EVENT_CDMA_PROVISION_STATUS_UPDATE           = 2;
+    private static final int EVENT_SERVICE_STATE_CHANGED                  = 3;
+    private static final int EVENT_START_OTASP_CALL                       = 4;
+
+    /* use iccid to detect hot sim swap */
+    private static String sIccId = null;
+
+    private Phone mPhone;
+    /* committed flag indicates Otasp call succeed */
+    private boolean mIsOtaspCallCommitted = false;
+
+    @Override
+    public void onCreate() {
+        logd("otasp service onCreate");
+        mPhone = PhoneGlobals.getPhone();
+        if ((sIccId == null) || !sIccId.equals(mPhone.getIccSerialNumber())) {
+            // reset to allow activation retry on new sim
+            sIccId = mPhone.getIccSerialNumber();
+            sOtaspCallRetries = 0;
+        }
+        sOtaspCallRetries++;
+        logd("OTASP call tried " + sOtaspCallRetries + " times");
+        if (sOtaspCallRetries > OTASP_CALL_RETRIES_MAX) {
+            logd("OTASP call exceeds max retries => activation failed");
+            //TODO updateActivationState(DEACTIVATED)
+            onComplete();
+            return;
+        }
+        mHandler.sendEmptyMessage(EVENT_START_OTASP_CALL);
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        return START_REDELIVER_INTENT;
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    private Handler mHandler = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case EVENT_SERVICE_STATE_CHANGED:
+                    logd("EVENT_SERVICE_STATE_CHANGED");
+                    onStartOtaspCall();
+                    break;
+                case EVENT_START_OTASP_CALL:
+                    logd("EVENT_START_OTASP_CALL");
+                    onStartOtaspCall();
+                    break;
+                case EVENT_CALL_STATE_CHANGED:
+                    logd("OTASP_CALL_STATE_CHANGED");
+                    onOtaspCallStateChanged();
+                    break;
+                case EVENT_CDMA_PROVISION_STATUS_UPDATE:
+                    logd("OTASP_ACTIVATION_STATUS_UPDATE_EVENT");
+                    onCdmaProvisionStatusUpdate((AsyncResult) msg.obj);
+                    break;
+                case EVENT_CDMA_OTASP_CALL_RETRY:
+                    logd("EVENT_CDMA_OTASP_CALL_RETRY");
+                    onStartOtaspCall();
+                    break;
+                default:
+                    loge("invalid msg: " + msg.what + " not handled.");
+            }
+        }
+    };
+
+    /**
+     * Starts the OTASP call without any UI.
+     * platform only support background non-interactive otasp call, but users could still dial
+     * interactive OTASP number through dialer if carrier allows (some carrier will
+     * explicitly block any outgoing *288XX number).
+     */
+    private void onStartOtaspCall() {
+        unregisterAll();
+        if (mPhone.getServiceState().getState() != ServiceState.STATE_IN_SERVICE) {
+            loge("OTASP call failure, wait for network available.");
+            mPhone.registerForServiceStateChanged(mHandler, EVENT_SERVICE_STATE_CHANGED, null);
+            return;
+        }
+        // otasp call follows with CDMA OTA PROVISION STATUS update which signals activation result
+        mPhone.registerForCdmaOtaStatusChange(mHandler, EVENT_CDMA_PROVISION_STATUS_UPDATE, null);
+        mPhone.registerForPreciseCallStateChanged(mHandler, EVENT_CALL_STATE_CHANGED, null);
+        logd("startNonInteractiveOtasp: placing call to '" + OTASP_NUMBER + "'...");
+        int callStatus = PhoneUtils.placeCall(this,
+                getPhone(),
+                OTASP_NUMBER,
+                null,   // contactRef
+                false); // isEmergencyCall
+        if (callStatus == PhoneUtils.CALL_STATUS_DIALED) {
+            if (DBG) logd("  ==> success return from placeCall(): callStatus = " + callStatus);
+        } else {
+            loge(" ==> failure return from placeCall(): callStatus = " + callStatus);
+            mHandler.sendEmptyMessageDelayed(EVENT_CDMA_OTASP_CALL_RETRY,
+                    OTASP_CALL_RETRY_PERIOD_IN_MS);
+        }
+    }
+
+    /**
+     * register for cdma ota provision status
+     * see RIL_CDMA_OTA_ProvisionStatus in include/telephony/ril.h
+     */
+    private void onCdmaProvisionStatusUpdate(AsyncResult r) {
+        int[] otaStatus = (int[]) r.result;
+        logd("onCdmaProvisionStatusUpdate: " + otaStatus[0]);
+        if (Phone.CDMA_OTA_PROVISION_STATUS_COMMITTED == otaStatus[0]) {
+            mIsOtaspCallCommitted = true;
+        }
+    }
+
+    /**
+     * update activation state upon call disconnected.
+     * check the mIsOtaspCallCommitted bit, and if that's true it means that activation
+     * was successful.
+     */
+    private void onOtaspCallStateChanged() {
+        logd("onOtaspCallStateChanged: " + mPhone.getState());
+        if (mPhone.getState().equals(PhoneConstants.State.IDLE)) {
+            if (mIsOtaspCallCommitted) {
+                logd("Otasp activation succeed");
+                //TODO updateActivationState(ACTIVATED)
+            } else {
+                logd("Otasp activation failed");
+                //TODO updateActivationState(DEACTIVATED)
+            }
+            onComplete();
+        }
+    }
+
+    private void onComplete() {
+        logd("otasp service onComplete");
+        unregisterAll();
+        stopSelf();
+    }
+
+    private void unregisterAll() {
+        mPhone.unregisterForCdmaOtaStatusChange(mHandler);
+        mPhone.unregisterForSubscriptionInfoReady(mHandler);
+        mPhone.unregisterForServiceStateChanged(mHandler);
+        mPhone.unregisterForPreciseCallStateChanged(mHandler);
+        mHandler.removeCallbacksAndMessages(null);
+    }
+
+    private static void logd(String s) {
+        android.util.Log.d(TAG, s);
+    }
+
+    private static void loge(String s) {
+        android.util.Log.e(TAG, s);
+    }
+}
diff --git a/src/com/android/phone/otasp/OtaspSimStateReceiver.java b/src/com/android/phone/otasp/OtaspSimStateReceiver.java
new file mode 100644
index 0000000..ef34e20
--- /dev/null
+++ b/src/com/android/phone/otasp/OtaspSimStateReceiver.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2017 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.otasp;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.PersistableBundle;
+import android.telephony.CarrierConfigManager;
+import android.telephony.PhoneStateListener;
+import android.telephony.TelephonyManager;
+import android.util.Log;
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.ServiceStateTracker;
+import com.android.phone.PhoneGlobals;
+
+public class OtaspSimStateReceiver extends BroadcastReceiver {
+    private static final String TAG = OtaspSimStateReceiver.class.getSimpleName();
+    private static final boolean DBG = true;
+    private Context mContext;
+
+    private PhoneStateListener mPhoneStateListener = new PhoneStateListener(){
+        @Override
+        public void onOtaspChanged(int otaspMode) {
+            logd("onOtaspChanged: otaspMode=" + otaspMode);
+            if (otaspMode == ServiceStateTracker.OTASP_NEEDED && isCarrierSupported()
+                    && PhoneGlobals.getPhone().getIccRecordsLoaded()) {
+                logd("otasp activation required, start otaspActivationService");
+                mContext.startService(new Intent(mContext, OtaspActivationService.class));
+            }
+        }
+    };
+
+    /**
+     * check if OTA service provisioning activation is supported by the current carrier
+     * @return true if otasp activation is needed, false otherwise
+     */
+    private static boolean isCarrierSupported() {
+        final Phone phone = PhoneGlobals.getPhone();
+        final Context context = phone.getContext();
+        if (context != null) {
+            PersistableBundle b = null;
+            final CarrierConfigManager configManager = (CarrierConfigManager) context
+                    .getSystemService(Context.CARRIER_CONFIG_SERVICE);
+            if (configManager != null) {
+                b = configManager.getConfig();
+            }
+            if (b != null && b.getBoolean(
+                    CarrierConfigManager.KEY_USE_OTASP_FOR_PROVISIONING_BOOL)) {
+                return true;
+            }
+        }
+        logd("otasp activation not needed: no supported carrier");
+        return false;
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        mContext = context;
+        if(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED.equals(intent.getAction())) {
+            if (DBG) logd("Received intent: " + intent.getAction());
+            final TelephonyManager telephonyManager = (TelephonyManager) context
+                    .getSystemService(Context.TELEPHONY_SERVICE);
+            telephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_OTASP_CHANGED);
+        }
+    }
+
+    private static void logd(String s) {
+        Log.d(TAG, s);
+    }
+}
+