diff --git a/telephony/java/com/android/internal/telephony/PhoneBase.java b/telephony/java/com/android/internal/telephony/PhoneBase.java
index 1c03c5a..50dd76a 100644
--- a/telephony/java/com/android/internal/telephony/PhoneBase.java
+++ b/telephony/java/com/android/internal/telephony/PhoneBase.java
@@ -114,6 +114,7 @@
     boolean mDoesRilSendMultipleCallRing;
     int mCallRingContinueToken = 0;
     int mCallRingDelay;
+    public boolean mIsTheCurrentActivePhone = true;
 
     /**
      * Set a system property, unless we're in unit test mode
@@ -226,6 +227,8 @@
     public void dispose() {
         synchronized(PhoneProxy.lockForRadioTechnologyChange) {
             mCM.unSetOnCallRing(this);
+            mDataConnection.onCleanUpConnection(false, REASON_RADIO_TURNED_OFF);
+            mIsTheCurrentActivePhone = false;
         }
     }
 
diff --git a/telephony/java/com/android/internal/telephony/PhoneProxy.java b/telephony/java/com/android/internal/telephony/PhoneProxy.java
index b1eaa93..c693ae1 100644
--- a/telephony/java/com/android/internal/telephony/PhoneProxy.java
+++ b/telephony/java/com/android/internal/telephony/PhoneProxy.java
@@ -23,6 +23,7 @@
 import android.content.SharedPreferences;
 import android.os.Handler;
 import android.os.Message;
+import android.os.SystemProperties;
 import android.preference.PreferenceManager;
 import android.telephony.CellLocation;
 import android.telephony.PhoneStateListener;
@@ -40,8 +41,6 @@
 
 public class PhoneProxy extends Handler implements Phone {
     public final static Object lockForRadioTechnologyChange = new Object();
-//    private static boolean radioTechnologyChangeGsmToCdma = false;
-//    private static boolean radioTechnologyChangeCdmaToGsm = false;
 
     private Phone mActivePhone;
     private String mOutgoingPhone;
@@ -50,12 +49,16 @@
     private IccPhoneBookInterfaceManagerProxy mIccPhoneBookInterfaceManagerProxy;
     private PhoneSubInfoProxy mPhoneSubInfoProxy;
 
+    private boolean mResetModemOnRadioTechnologyChange = false;
+
     private static final int EVENT_RADIO_TECHNOLOGY_CHANGED = 1;
     private static final String LOG_TAG = "PHONE";
 
     //***** Class Methods
     public PhoneProxy(Phone phone) {
         mActivePhone = phone;
+        mResetModemOnRadioTechnologyChange = SystemProperties.getBoolean(
+                TelephonyProperties.PROPERTY_RESET_ON_RADIO_TECH_CHANGE, false);
         mIccSmsInterfaceManagerProxy = new IccSmsInterfaceManagerProxy(
                 phone.getIccSmsInterfaceManager());
         mIccPhoneBookInterfaceManagerProxy = new IccPhoneBookInterfaceManagerProxy(
@@ -74,12 +77,15 @@
             mOutgoingPhone = ((PhoneBase)mActivePhone).getPhoneName();
             logd("Switching phone from " + mOutgoingPhone + "Phone to " +
                     (mOutgoingPhone.equals("GSM") ? "CDMAPhone" : "GSMPhone") );
-            boolean oldPowerState = false; //old power state to off
-            if (mCommandsInterface.getRadioState().isOn()) {
-                oldPowerState = true;
-                logd("Setting Radio Power to Off");
-                mCommandsInterface.setRadioPower(false, null);
+            boolean oldPowerState = false; // old power state to off
+            if (mResetModemOnRadioTechnologyChange) {
+                if (mCommandsInterface.getRadioState().isOn()) {
+                    oldPowerState = true;
+                    logd("Setting Radio Power to Off");
+                    mCommandsInterface.setRadioPower(false, null);
+                }
             }
+
             if(mOutgoingPhone.equals("GSM")) {
                 logd("Make a new CDMAPhone and destroy the old GSMPhone.");
 
@@ -93,8 +99,6 @@
                 //System.gc();
 
                 mActivePhone = PhoneFactory.getCdmaPhone();
-                logd("Resetting Radio");
-                mCommandsInterface.setRadioPower(oldPowerState, null);
                 ((GSMPhone)oldPhone).removeReferences();
                 oldPhone = null;
             } else {
@@ -111,12 +115,15 @@
                 //System.gc();
 
                 mActivePhone = PhoneFactory.getGsmPhone();
-                logd("Resetting Radio:");
-                mCommandsInterface.setRadioPower(oldPowerState, null);
                 ((CDMAPhone)oldPhone).removeReferences();
                 oldPhone = null;
             }
 
+            if (mResetModemOnRadioTechnologyChange) {
+                logd("Resetting Radio");
+                mCommandsInterface.setRadioPower(oldPowerState, null);
+            }
+
             //Set the new interfaces in the proxy's
             mIccSmsInterfaceManagerProxy.setmIccSmsInterfaceManager(
                     mActivePhone.getIccSmsInterfaceManager());
diff --git a/telephony/java/com/android/internal/telephony/TelephonyProperties.java b/telephony/java/com/android/internal/telephony/TelephonyProperties.java
index 56d84bd..a113787 100644
--- a/telephony/java/com/android/internal/telephony/TelephonyProperties.java
+++ b/telephony/java/com/android/internal/telephony/TelephonyProperties.java
@@ -141,4 +141,10 @@
      * Property to override DEFAULT_WAKE_LOCK_TIMEOUT
      */
     static final String PROPERTY_WAKE_LOCK_TIMEOUT = "ro.ril.wake_lock_timeout";
+
+    /**
+     * Set to true to indicate that the modem needs to be reset
+     * when there is a radio technology change.
+     */
+    static final String PROPERTY_RESET_ON_RADIO_TECH_CHANGE = "persist.radio.reset_on_switch";
 }
diff --git a/telephony/java/com/android/internal/telephony/cdma/CdmaDataConnectionTracker.java b/telephony/java/com/android/internal/telephony/cdma/CdmaDataConnectionTracker.java
index 9bc5e8e..b63b0c4 100644
--- a/telephony/java/com/android/internal/telephony/cdma/CdmaDataConnectionTracker.java
+++ b/telephony/java/com/android/internal/telephony/cdma/CdmaDataConnectionTracker.java
@@ -871,7 +871,7 @@
         EventLog.writeEvent(TelephonyEventLog.EVENT_LOG_CDMA_DATA_DROP, val);
     }
 
-    protected void onDataStateChanged (AsyncResult ar) {
+    protected void onDataStateChanged(AsyncResult ar) {
         ArrayList<DataCallState> dataCallStates = (ArrayList<DataCallState>)(ar.result);
 
         if (ar.exception != null) {
@@ -882,32 +882,46 @@
         }
 
         if (state == State.CONNECTED) {
-            if (dataCallStates.size() >= 1) {
-                switch (dataCallStates.get(0).active) {
+            boolean isActiveOrDormantConnectionPresent = false;
+            int connectionState = DATA_CONNECTION_ACTIVE_PH_LINK_INACTIVE;
+
+            // Check for an active or dormant connection element in
+            // the DATA_CALL_LIST array
+            for (int index = 0; index < dataCallStates.size(); index++) {
+                connectionState = dataCallStates.get(index).active;
+                if (connectionState != DATA_CONNECTION_ACTIVE_PH_LINK_INACTIVE) {
+                    isActiveOrDormantConnectionPresent = true;
+                    break;
+                }
+            }
+
+            if (!isActiveOrDormantConnectionPresent) {
+                // No active or dormant connection
+                Log.i(LOG_TAG, "onDataStateChanged: No active connection"
+                        + "state is CONNECTED, disconnecting/cleanup");
+                writeEventLogCdmaDataDrop();
+                cleanUpConnection(true, null);
+                return;
+            }
+
+            switch (connectionState) {
                 case DATA_CONNECTION_ACTIVE_PH_LINK_UP:
                     Log.v(LOG_TAG, "onDataStateChanged: active=LINK_ACTIVE && CONNECTED, ignore");
                     activity = Activity.NONE;
                     phone.notifyDataActivity();
+                    startNetStatPoll();
                     break;
-                case DATA_CONNECTION_ACTIVE_PH_LINK_INACTIVE:
-                    Log.v(LOG_TAG,
-                    "onDataStateChanged active=LINK_INACTIVE && CONNECTED, disconnecting/cleanup");
-                    writeEventLogCdmaDataDrop();
-                    cleanUpConnection(true, null);
-                    break;
+
                 case DATA_CONNECTION_ACTIVE_PH_LINK_DOWN:
                     Log.v(LOG_TAG, "onDataStateChanged active=LINK_DOWN && CONNECTED, dormant");
                     activity = Activity.DORMANT;
                     phone.notifyDataActivity();
+                    stopNetStatPoll();
                     break;
+
                 default:
                     Log.v(LOG_TAG, "onDataStateChanged: IGNORE unexpected DataCallState.active="
-                            + dataCallStates.get(0).active);
-                }
-            } else {
-                Log.v(LOG_TAG, "onDataStateChanged: network disconnected, clean up");
-                writeEventLogCdmaDataDrop();
-                cleanUpConnection(true, null);
+                            + connectionState);
             }
         } else {
             // TODO: Do we need to do anything?
@@ -954,6 +968,11 @@
 
     public void handleMessage (Message msg) {
 
+        if (!phone.mIsTheCurrentActivePhone) {
+            Log.d(LOG_TAG, "Ignore CDMA msgs since CDMA phone is inactive");
+            return;
+        }
+
         switch (msg.what) {
             case EVENT_RECORDS_LOADED:
                 onRecordsLoaded();
diff --git a/telephony/java/com/android/internal/telephony/gsm/GsmDataConnectionTracker.java b/telephony/java/com/android/internal/telephony/gsm/GsmDataConnectionTracker.java
index d014a7e..494d0e0 100644
--- a/telephony/java/com/android/internal/telephony/gsm/GsmDataConnectionTracker.java
+++ b/telephony/java/com/android/internal/telephony/gsm/GsmDataConnectionTracker.java
@@ -1454,6 +1454,12 @@
 
     public void handleMessage (Message msg) {
         if (DBG) Log.d(LOG_TAG,"GSMDataConnTrack handleMessage "+msg);
+
+        if (!mGsmPhone.mIsTheCurrentActivePhone) {
+            Log.d(LOG_TAG, "Ignore GSM msgs since GSM phone is inactive");
+            return;
+        }
+
         switch (msg.what) {
             case EVENT_RECORDS_LOADED:
                 onRecordsLoaded();