diff --git a/res/layout/radio_info.xml b/res/layout/radio_info.xml
index c1d6ff6..57c37da 100644
--- a/res/layout/radio_info.xml
+++ b/res/layout/radio_info.xml
@@ -25,6 +25,19 @@
         android:descendantFocusability="beforeDescendants"
         android:focusableInTouchMode="true">
 
+        <!-- Phone index -->
+        <TextView
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text="@string/phone_index_label"
+                style="@style/info_label"
+                />
+
+        <Spinner android:id="@+id/phoneIndex"
+                 android:layout_width="match_parent"
+                 android:layout_height="wrap_content"
+                />
+
         <!-- IMEI -->
         <LinearLayout style="@style/entry_layout">
             <TextView android:text="@string/radio_info_imei_label" style="@style/info_label" />
@@ -37,6 +50,18 @@
             <TextView android:id="@+id/number" style="@style/info_value" />
         </LinearLayout>
 
+        <!-- Subscription ID -->
+        <LinearLayout style="@style/entry_layout">
+            <TextView android:text="@string/radio_info_subid" style="@style/info_label" />
+            <TextView android:id="@+id/subid" style="@style/info_value" />
+        </LinearLayout>
+
+        <!-- Default data subscription -->
+        <LinearLayout style="@style/entry_layout">
+            <TextView android:text="@string/radio_info_dds" style="@style/info_label" />
+            <TextView android:id="@+id/dds" style="@style/info_value" />
+        </LinearLayout>
+
         <!-- IMSI -->
         <LinearLayout style="@style/entry_layout">
             <TextView android:text="@string/radio_info_imsi_label" style="@style/info_label" />
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 44e26c3..220cec3 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -483,6 +483,10 @@
     <string name="proxy_url_title">"PAC URL: "</string>
 
     <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
+    <string name="radio_info_subid">Current subId:</string>
+    <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
+    <string name="radio_info_dds">SubId of default data SIM:</string>
+    <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
     <string name="radio_info_dl_kbps">DL Bandwidth (kbps):</string>
     <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
     <string name="radio_info_ul_kbps">UL Bandwidth (kbps):</string>
@@ -529,6 +533,8 @@
     <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
     <string name="radio_info_data_network_type_label">Data Network Type:</string>
     <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
+    <string name="phone_index_label">Select phone index</string>
+    <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
     <string name="radio_info_set_perferred_label">Set Preferred Network Type:</string>
     <!-- Radio Info screen. Label for a status item.  Used for diagnostic info screens, precise translation isn't needed -->
     <string name="radio_info_ping_hostname_v4">Ping Hostname(www.google.com) IPv4:</string>
diff --git a/src/com/android/settings/RadioInfo.java b/src/com/android/settings/RadioInfo.java
index 8da507b..32e209e 100644
--- a/src/com/android/settings/RadioInfo.java
+++ b/src/com/android/settings/RadioInfo.java
@@ -127,6 +127,7 @@
             "Unknown"
     };
 
+    private static String[] mPhoneIndexLabels;
 
     private static final int CELL_INFO_LIST_RATE_DISABLED = Integer.MAX_VALUE;
     private static final int CELL_INFO_LIST_RATE_MAX = 0;
@@ -162,7 +163,7 @@
         60000
     };
 
-    private void log(String s) {
+    private static void log(String s) {
         Log.d(TAG, s);
     }
 
@@ -173,15 +174,17 @@
     private static final int EVENT_QUERY_SMSC_DONE = 1005;
     private static final int EVENT_UPDATE_SMSC_DONE = 1006;
 
-    private static final int MENU_ITEM_SELECT_BAND  = 0;
-    private static final int MENU_ITEM_VIEW_ADN     = 1;
-    private static final int MENU_ITEM_VIEW_FDN     = 2;
-    private static final int MENU_ITEM_VIEW_SDN     = 3;
-    private static final int MENU_ITEM_GET_IMS_STATUS = 4;
-    private static final int MENU_ITEM_TOGGLE_DATA  = 5;
+    private static final int MENU_ITEM_SELECT_BAND         = 0;
+    private static final int MENU_ITEM_VIEW_ADN            = 1;
+    private static final int MENU_ITEM_VIEW_FDN            = 2;
+    private static final int MENU_ITEM_VIEW_SDN            = 3;
+    private static final int MENU_ITEM_GET_IMS_STATUS      = 4;
+    private static final int MENU_ITEM_TOGGLE_DATA         = 5;
 
     private TextView mDeviceId; //DeviceId is the IMEI in GSM and the MEID in CDMA
     private TextView number;
+    private TextView mSubscriptionId;
+    private TextView mDds;
     private TextView mSubscriberId;
     private TextView callState;
     private TextView operatorName;
@@ -219,6 +222,7 @@
     private Switch imsWfcProvisionedSwitch;
     private Switch eabProvisionedSwitch;
     private Spinner preferredNetworkType;
+    private Spinner mSelectPhoneIndex;
     private Spinner cellInfoRefreshRateSpinner;
 
     private ConnectivityManager mConnectivityManager;
@@ -237,6 +241,7 @@
 
     private int mPreferredNetworkTypeResult;
     private int mCellInfoRefreshRateIndex;
+    private int mSelectedPhoneIndex;
 
     private final NetworkRequest mDefaultNetworkRequest = new NetworkRequest.Builder()
             .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
@@ -346,6 +351,21 @@
         preferredNetworkType.setSelection(mPreferredNetworkTypeResult, true);
     }
 
+    private void updatePhoneIndex(int phoneIndex, int subId) {
+        // unregister listeners on the old subId
+        mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);
+        mTelephonyManager.setCellInfoListRate(CELL_INFO_LIST_RATE_DISABLED);
+
+        // update the subId
+        mTelephonyManager = mTelephonyManager.createForSubscriptionId(subId);
+        mImsManager = ImsManager.getInstance(getApplicationContext(), phoneIndex);
+
+        // update the phoneId
+        phone = PhoneFactory.getPhone(phoneIndex);
+
+        updateAllFields();
+    }
+
     private Handler mHandler = new Handler() {
         @Override
         public void handleMessage(Message msg) {
@@ -406,13 +426,15 @@
         mConnectivityManager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
         phone = PhoneFactory.getDefaultPhone();
 
-        //TODO: Need to update this if the default phoneId changes?
-        //      Better to have an instance per phone?
         mImsManager = ImsManager.getInstance(getApplicationContext(),
                 SubscriptionManager.getDefaultVoicePhoneId());
 
+        mPhoneIndexLabels = getPhoneIndexLabels(mTelephonyManager);
+
         mDeviceId = (TextView) findViewById(R.id.imei);
         number = (TextView) findViewById(R.id.number);
+        mSubscriptionId = (TextView) findViewById(R.id.subid);
+        mDds = (TextView) findViewById(R.id.dds);
         mSubscriberId = (TextView) findViewById(R.id.imsi);
         callState = (TextView) findViewById(R.id.call);
         operatorName = (TextView) findViewById(R.id.operator);
@@ -439,10 +461,17 @@
         mPhyChanConfig = (TextView) findViewById(R.id.phy_chan_config);
 
         preferredNetworkType = (Spinner) findViewById(R.id.preferredNetworkType);
-        ArrayAdapter<String> adapter = new ArrayAdapter<String> (this,
+        ArrayAdapter<String> preferredNetworkTypeAdapter = new ArrayAdapter<String> (this,
                 android.R.layout.simple_spinner_item, mPreferredNetworkLabels);
-        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
-        preferredNetworkType.setAdapter(adapter);
+        preferredNetworkTypeAdapter
+                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        preferredNetworkType.setAdapter(preferredNetworkTypeAdapter);
+
+        mSelectPhoneIndex = (Spinner) findViewById(R.id.phoneIndex);
+        ArrayAdapter<String> phoneIndexAdapter = new ArrayAdapter<String> (this,
+                android.R.layout.simple_spinner_item, mPhoneIndexLabels);
+        phoneIndexAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        mSelectPhoneIndex.setAdapter(phoneIndexAdapter);
 
         cellInfoRefreshRateSpinner = (Spinner) findViewById(R.id.cell_info_rate_select);
         ArrayAdapter<String> cellInfoAdapter = new ArrayAdapter<String>(this,
@@ -493,6 +522,7 @@
 
         mCellInfoRefreshRateIndex = 0; //disabled
         mPreferredNetworkTypeResult = mPreferredNetworkLabels.length - 1; //Unknown
+        mSelectedPhoneIndex = 0; //phone 0
 
         //FIXME: Replace with TelephonyManager call
         phone.getPreferredNetworkType(
@@ -507,6 +537,10 @@
 
         log("Started onResume");
 
+        updateAllFields();
+    }
+
+    private void updateAllFields() {
         updateMessageWaiting();
         updateCallRedirect();
         updateDataState();
@@ -519,6 +553,7 @@
 
         updateLocation(mCellLocationResult);
         updateCellInfo(mCellInfoResult);
+        updateSubscriptionIds();
 
         mPingHostnameV4.setText(mPingHostnameResultV4);
         mPingHostnameV6.setText(mPingHostnameResultV6);
@@ -532,25 +567,17 @@
         preferredNetworkType.setSelection(mPreferredNetworkTypeResult, true);
         preferredNetworkType.setOnItemSelectedListener(mPreferredNetworkHandler);
 
+        // set phone index
+        mSelectPhoneIndex.setSelection(mSelectedPhoneIndex, true);
+        mSelectPhoneIndex.setOnItemSelectedListener(mSelectPhoneIndexHandler);
+
         radioPowerOnSwitch.setOnCheckedChangeListener(mRadioPowerOnChangeListener);
         imsVolteProvisionedSwitch.setOnCheckedChangeListener(mImsVolteCheckedChangeListener);
         imsVtProvisionedSwitch.setOnCheckedChangeListener(mImsVtCheckedChangeListener);
         imsWfcProvisionedSwitch.setOnCheckedChangeListener(mImsWfcCheckedChangeListener);
         eabProvisionedSwitch.setOnCheckedChangeListener(mEabCheckedChangeListener);
 
-        mTelephonyManager.listen(mPhoneStateListener,
-                  PhoneStateListener.LISTEN_CALL_STATE
-        //b/27803938 - RadioInfo currently cannot read PRECISE_CALL_STATE
-        //      | PhoneStateListener.LISTEN_PRECISE_CALL_STATE
-                | PhoneStateListener.LISTEN_DATA_CONNECTION_STATE
-                | PhoneStateListener.LISTEN_DATA_ACTIVITY
-                | PhoneStateListener.LISTEN_CELL_LOCATION
-                | PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR
-                | PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR
-                | PhoneStateListener.LISTEN_CELL_INFO
-                | PhoneStateListener.LISTEN_SERVICE_STATE
-                | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS
-                | PhoneStateListener.LISTEN_PHYSICAL_CHANNEL_CONFIGURATION);
+        registerPhoneStateListener();
 
         mConnectivityManager.registerNetworkCallback(
                 mDefaultNetworkRequest, mNetworkCallback, mHandler);
@@ -586,6 +613,8 @@
         mPreferredNetworkTypeResult = b.getInt("mPreferredNetworkTypeResult",
                                                mPreferredNetworkLabels.length - 1);
 
+        mSelectedPhoneIndex = b.getInt("mSelectedPhoneIndex", 0);
+
         mCellInfoRefreshRateIndex = b.getInt("mCellInfoRefreshRateIndex", 0);
     }
 
@@ -596,6 +625,7 @@
         outState.putString("mHttpClientTestResult", mHttpClientTestResult);
 
         outState.putInt("mPreferredNetworkTypeResult", mPreferredNetworkTypeResult);
+        outState.putInt("mSelectedPhoneIndex", mSelectedPhoneIndex);
         outState.putInt("mCellInfoRefreshRateIndex", mCellInfoRefreshRateIndex);
 
     }
@@ -643,6 +673,34 @@
         return true;
     }
 
+    // returns array of string labels for each phone index. The array index is equal to the phone
+    // index.
+    private static String[] getPhoneIndexLabels(TelephonyManager tm) {
+        int phones = tm.getPhoneCount();
+        String[] labels = new String[phones];
+        for (int i = 0; i < phones; i++) {
+            labels[i] = "Phone " + i;
+        }
+        return labels;
+    }
+
+    // register mPhoneStateListener for relevant fields using the current TelephonyManager
+    private void registerPhoneStateListener() {
+        mTelephonyManager.listen(mPhoneStateListener,
+                  PhoneStateListener.LISTEN_CALL_STATE
+        //b/27803938 - RadioInfo currently cannot read PRECISE_CALL_STATE
+        //      | PhoneStateListener.LISTEN_PRECISE_CALL_STATE
+                | PhoneStateListener.LISTEN_DATA_CONNECTION_STATE
+                | PhoneStateListener.LISTEN_DATA_ACTIVITY
+                | PhoneStateListener.LISTEN_CELL_LOCATION
+                | PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR
+                | PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR
+                | PhoneStateListener.LISTEN_CELL_INFO
+                | PhoneStateListener.LISTEN_SERVICE_STATE
+                | PhoneStateListener.LISTEN_SIGNAL_STRENGTHS
+                | PhoneStateListener.LISTEN_PHYSICAL_CHANNEL_CONFIGURATION);
+    }
+
     private void updateDnsCheckState() {
         //FIXME: Replace with a TelephonyManager call
         dnsCheckState.setText(phone.isDnsCheckDisabled() ?
@@ -864,6 +922,11 @@
         mCellInfo.setText(buildCellInfoString(arrayCi));
     }
 
+    private final void updateSubscriptionIds() {
+        mSubscriptionId.setText(Integer.toString(phone.getSubId()));
+        mDds.setText(Integer.toString(SubscriptionManager.getDefaultDataSubscriptionId()));
+    }
+
     private final void
     updateMessageWaiting() {
         mMwi.setText(String.valueOf(mMwiValue));
@@ -1487,6 +1550,35 @@
         }
     };
 
+    AdapterView.OnItemSelectedListener mSelectPhoneIndexHandler =
+            new AdapterView.OnItemSelectedListener() {
+
+        public void onItemSelected(AdapterView parent, View v, int pos, long id) {
+            if (pos >= 0 && pos <= mPhoneIndexLabels.length - 1) {
+                // the array position is equal to the phone index
+                int phoneIndex = pos;
+                Phone[] phones = PhoneFactory.getPhones();
+                if (phones == null || phones.length <= phoneIndex) {
+                    log("phoneIndex " + phoneIndex + " is invalid");
+                    return;
+                }
+                log("switching to phone " + phoneIndex);
+                // getSubId says it takes a slotIndex, but it actually takes a phone index
+                int[] subIds = SubscriptionManager.getSubId(phoneIndex);
+                if (subIds == null || subIds.length < 1) {
+                    log("no subscription found for phoneIndex " + phoneIndex);
+                    return;
+                }
+                mSelectedPhoneIndex = phoneIndex;
+
+                updatePhoneIndex(phoneIndex, subIds[0]);
+            }
+        }
+
+        public void onNothingSelected(AdapterView parent) {
+        }
+    };
+
     AdapterView.OnItemSelectedListener mCellInfoRefreshRateHandler  =
             new AdapterView.OnItemSelectedListener() {