diff --git a/location/java/android/location/Country.java b/location/java/android/location/Country.java
index 939bd4a..7c1485d 100755
--- a/location/java/android/location/Country.java
+++ b/location/java/android/location/Country.java
@@ -18,6 +18,7 @@
 
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.os.SystemClock;
 
 import java.util.Locale;
 
@@ -58,8 +59,14 @@
     private final int mSource;
 
     private int mHashCode;
+
     /**
-     *
+     * Time that this object was created (which we assume to be the time that the source was
+     * consulted). This time is in milliseconds since boot up.
+     */
+    private final long mTimestamp;
+
+    /**
      * @param countryIso the ISO 3166-1 two letters country code.
      * @param source where the countryIso came from, could be one of below
      *        values
@@ -78,11 +85,23 @@
         }
         mCountryIso = countryIso.toUpperCase(Locale.US);
         mSource = source;
+        mTimestamp = SystemClock.elapsedRealtime();
+    }
+
+    private Country(final String countryIso, final int source, long timestamp) {
+        if (countryIso == null || source < COUNTRY_SOURCE_NETWORK
+                || source > COUNTRY_SOURCE_LOCALE) {
+            throw new IllegalArgumentException();
+        }
+        mCountryIso = countryIso.toUpperCase(Locale.US);
+        mSource = source;
+        mTimestamp = timestamp;
     }
 
     public Country(Country country) {
         mCountryIso = country.mCountryIso;
         mSource = country.mSource;
+        mTimestamp = country.mTimestamp;
     }
 
     /**
@@ -106,9 +125,17 @@
         return mSource;
     }
 
+    /**
+     * Returns the time that this object was created (which we assume to be the time that the source
+     * was consulted).
+     */
+    public final long getTimestamp() {
+        return mTimestamp;
+    }
+
     public static final Parcelable.Creator<Country> CREATOR = new Parcelable.Creator<Country>() {
         public Country createFromParcel(Parcel in) {
-            return new Country(in.readString(), in.readInt());
+            return new Country(in.readString(), in.readInt(), in.readLong());
         }
 
         public Country[] newArray(int size) {
@@ -123,8 +150,14 @@
     public void writeToParcel(Parcel parcel, int flags) {
         parcel.writeString(mCountryIso);
         parcel.writeInt(mSource);
+        parcel.writeLong(mTimestamp);
     }
 
+    /**
+     * Returns true if this {@link Country} is equivalent to the given object. This ignores
+     * the timestamp value and just checks for equivalence of countryIso and source values.
+     * Returns false otherwise.
+     */
     @Override
     public boolean equals(Object object) {
         if (object == this) {
@@ -132,6 +165,7 @@
         }
         if (object instanceof Country) {
             Country c = (Country) object;
+            // No need to check the equivalence of the timestamp
             return mCountryIso.equals(c.getCountryIso()) && mSource == c.getSource();
         }
         return false;
@@ -150,8 +184,8 @@
     }
 
     /**
-     * Compare the specified country to this country object ignoring the mSource
-     * field, return true if the countryIso fields are equal
+     * Compare the specified country to this country object ignoring the source
+     * and timestamp fields, return true if the countryIso fields are equal
      *
      * @param country the country to compare
      * @return true if the specified country's countryIso field is equal to this
@@ -160,4 +194,9 @@
     public boolean equalsIgnoreSource(Country country) {
         return country != null && mCountryIso.equals(country.getCountryIso());
     }
+
+    @Override
+    public String toString() {
+        return "Country {ISO=" + mCountryIso + ", source=" + mSource + ", time=" + mTimestamp + "}";
+    }
 }
diff --git a/services/java/com/android/server/CountryDetectorService.java b/services/java/com/android/server/CountryDetectorService.java
index 3081ebe..ab61a3c 100644
--- a/services/java/com/android/server/CountryDetectorService.java
+++ b/services/java/com/android/server/CountryDetectorService.java
@@ -16,6 +16,8 @@
 
 package com.android.server;
 
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
 import java.util.HashMap;
 
 import com.android.server.location.ComprehensiveCountryDetector;
@@ -30,6 +32,8 @@
 import android.os.Looper;
 import android.os.Process;
 import android.os.RemoteException;
+import android.util.PrintWriterPrinter;
+import android.util.Printer;
 import android.util.Slog;
 
 /**
@@ -75,7 +79,7 @@
         }
     }
 
-    private final static String TAG = "CountryDetectorService";
+    private final static String TAG = "CountryDetector";
 
     private final HashMap<IBinder, Receiver> mReceivers;
     private final Context mContext;
@@ -201,4 +205,20 @@
     boolean isSystemReady() {
         return mSystemReady;
     }
+
+    @Override
+    protected void dump(FileDescriptor fd, PrintWriter fout, String[] args) {
+        try {
+            final Printer p = new PrintWriterPrinter(fout);
+            p.println("CountryDetectorService state:");
+            p.println("  Number of listeners=" + mReceivers.keySet().size());
+            if (mCountryDetector == null) {
+                p.println("  ComprehensiveCountryDetector not initialized");
+            } else {
+                p.println("  " + mCountryDetector.toString());
+            }
+        } catch (Exception e) {
+            Slog.e(TAG, "Failed to dump CountryDetectorService: ", e);
+        }
+    }
 }
diff --git a/services/java/com/android/server/location/ComprehensiveCountryDetector.java b/services/java/com/android/server/location/ComprehensiveCountryDetector.java
index bb9e60f..2d6a148 100755
--- a/services/java/com/android/server/location/ComprehensiveCountryDetector.java
+++ b/services/java/com/android/server/location/ComprehensiveCountryDetector.java
@@ -20,16 +20,19 @@
 import android.location.Country;
 import android.location.CountryListener;
 import android.location.Geocoder;
+import android.os.SystemClock;
 import android.provider.Settings;
 import android.telephony.PhoneStateListener;
 import android.telephony.ServiceState;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
+import android.util.Log;
 import android.util.Slog;
 
 import java.util.Locale;
 import java.util.Timer;
 import java.util.TimerTask;
+import java.util.concurrent.ConcurrentLinkedQueue;
 
 /**
  * This class is used to detect the country where the user is. The sources of
@@ -55,10 +58,15 @@
  */
 public class ComprehensiveCountryDetector extends CountryDetectorBase {
 
-    private final static String TAG = "ComprehensiveCountryDetector";
+    private final static String TAG = "CountryDetector";
     /* package */ static final boolean DEBUG = false;
 
     /**
+     * Max length of logs to maintain for debugging.
+     */
+    private static final int MAX_LENGTH_DEBUG_LOGS = 20;
+
+    /**
      * The refresh interval when the location based country was used
      */
     private final static long LOCATION_REFRESH_INTERVAL = 1000 * 60 * 60 * 24; // 1 day
@@ -66,26 +74,58 @@
     protected CountryDetectorBase mLocationBasedCountryDetector;
     protected Timer mLocationRefreshTimer;
 
-    private final int mPhoneType;
     private Country mCountry;
-    private TelephonyManager mTelephonyManager;
+    private final TelephonyManager mTelephonyManager;
     private Country mCountryFromLocation;
     private boolean mStopped = false;
-    private ServiceState mLastState;
 
-    private PhoneStateListener mPhoneStateListener = new PhoneStateListener() {
-        @Override
-        public void onServiceStateChanged(ServiceState serviceState) {
-            // TODO: Find out how often we will be notified, if this method is called too
-            // many times, let's consider querying the network.
-            Slog.d(TAG, "onServiceStateChanged");
-            // We only care the state change
-            if (mLastState == null || mLastState.getState() != serviceState.getState()) {
-                detectCountry(true, true);
-                mLastState = new ServiceState(serviceState);
-            }
-        }
-    };
+    private PhoneStateListener mPhoneStateListener;
+
+    /**
+     * List of the most recent country state changes for debugging. This should have
+     * a max length of MAX_LENGTH_LOGS.
+     */
+    private final ConcurrentLinkedQueue<Country> mDebugLogs = new ConcurrentLinkedQueue<Country>();
+
+    /**
+     * Most recent {@link Country} result that was added to the debug logs {@link #mDebugLogs}.
+     * We keep track of this value to help prevent adding many of the same {@link Country} objects
+     * to the logs.
+     */
+    private Country mLastCountryAddedToLogs;
+
+    /**
+     * Object used to synchronize access to {@link #mLastCountryAddedToLogs}. Be careful if
+     * using it to synchronize anything else in this file.
+     */
+    private final Object mObject = new Object();
+
+    /**
+     * Start time of the current session for which the detector has been active.
+     */
+    private long mStartTime;
+
+    /**
+     * Stop time of the most recent session for which the detector was active.
+     */
+    private long mStopTime;
+
+    /**
+     * The sum of all the time intervals in which the detector was active.
+     */
+    private long mTotalTime;
+
+    /**
+     * Number of {@link PhoneStateListener#onServiceStateChanged(ServiceState state)} events that
+     * have occurred for the current session for which the detector has been active.
+     */
+    private int mCountServiceStateChanges;
+
+    /**
+     * Total number of {@link PhoneStateListener#onServiceStateChanged(ServiceState state)} events
+     * that have occurred for all time intervals in which the detector has been active.
+     */
+    private int mTotalCountServiceStateChanges;
 
     /**
      * The listener for receiving the notification from LocationBasedCountryDetector.
@@ -104,7 +144,6 @@
     public ComprehensiveCountryDetector(Context context) {
         super(context);
         mTelephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
-        mPhoneType = mTelephonyManager.getPhoneType();
     }
 
     @Override
@@ -115,6 +154,7 @@
 
     @Override
     public void stop() {
+        // Note: this method in this subclass called only by tests.
         Slog.i(TAG, "Stop the detector.");
         cancelLocationRefresh();
         removePhoneStateListener();
@@ -138,17 +178,50 @@
         if (result == null) {
             result = getLocaleCountry();
         }
+        addToLogs(result);
         return result;
     }
 
     /**
+     * Attempt to add this {@link Country} to the debug logs.
+     */
+    private void addToLogs(Country country) {
+        if (country == null) {
+            return;
+        }
+        // If the country (ISO and source) are the same as before, then there is no
+        // need to add this country as another entry in the logs. Synchronize access to this
+        // variable since multiple threads could be calling this method.
+        synchronized (mObject) {
+            if (mLastCountryAddedToLogs != null && mLastCountryAddedToLogs.equals(country)) {
+                return;
+            }
+            mLastCountryAddedToLogs = country;
+        }
+        // Manually maintain a max limit for the list of logs
+        if (mDebugLogs.size() >= MAX_LENGTH_DEBUG_LOGS) {
+            mDebugLogs.poll();
+        }
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Slog.d(TAG, country.toString());
+        }
+        mDebugLogs.add(country);
+    }
+
+    private boolean isNetworkCountryCodeAvailable() {
+        // On CDMA TelephonyManager.getNetworkCountryIso() just returns SIM country.  We don't want
+        // to prioritize it over location based country, so ignore it.
+        final int phoneType = mTelephonyManager.getPhoneType();
+        if (DEBUG) Slog.v(TAG, "    phonetype=" + phoneType);
+        return phoneType == TelephonyManager.PHONE_TYPE_GSM;
+    }
+
+    /**
      * @return the country from the mobile network.
      */
     protected Country getNetworkBasedCountry() {
         String countryIso = null;
-        // TODO: The document says the result may be unreliable on CDMA networks. Shall we use
-        // it on CDMA phone? We may test the Android primarily used countries.
-        if (mPhoneType == TelephonyManager.PHONE_TYPE_GSM) {
+        if (isNetworkCountryCodeAvailable()) {
             countryIso = mTelephonyManager.getNetworkCountryIso();
             if (!TextUtils.isEmpty(countryIso)) {
                 return new Country(countryIso, Country.COUNTRY_SOURCE_NETWORK);
@@ -226,9 +299,14 @@
             removePhoneStateListener();
             stopLocationBasedDetector();
             cancelLocationRefresh();
+            mStopTime = SystemClock.elapsedRealtime();
+            mTotalTime += mStopTime;
         } else if (prevListener == null) {
             addPhoneStateListener();
             detectCountry(false, true);
+            mStartTime = SystemClock.elapsedRealtime();
+            mStopTime = 0;
+            mCountServiceStateChanges = 0;
         }
     }
 
@@ -316,9 +394,9 @@
     private void notifyIfCountryChanged(final Country country, final Country detectedCountry) {
         if (detectedCountry != null && mListener != null
                 && (country == null || !country.equals(detectedCountry))) {
-            Slog.d(TAG,
-                    "The country was changed from " + country != null ? country.getCountryIso() :
-                        country + " to " + detectedCountry.getCountryIso());
+            if (Log.isLoggable(TAG, Log.DEBUG)) {
+                Slog.d(TAG, "" + country + " --> " + detectedCountry);
+            }
             notifyListener(detectedCountry);
         }
     }
@@ -356,20 +434,19 @@
     }
 
     protected synchronized void addPhoneStateListener() {
-        if (mPhoneStateListener == null && mPhoneType == TelephonyManager.PHONE_TYPE_GSM) {
-            mLastState = null;
+        if (mPhoneStateListener == null) {
             mPhoneStateListener = new PhoneStateListener() {
                 @Override
                 public void onServiceStateChanged(ServiceState serviceState) {
-                    // TODO: Find out how often we will be notified, if this
-                    // method is called too
-                    // many times, let's consider querying the network.
-                    Slog.d(TAG, "onServiceStateChanged");
-                    // We only care the state change
-                    if (mLastState == null || mLastState.getState() != serviceState.getState()) {
-                        detectCountry(true, true);
-                        mLastState = new ServiceState(serviceState);
+                    mCountServiceStateChanges++;
+                    mTotalCountServiceStateChanges++;
+
+                    if (!isNetworkCountryCodeAvailable()) {
+                        return;
                     }
+                    if (DEBUG) Slog.d(TAG, "onServiceStateChanged: " + serviceState.getState());
+
+                    detectCountry(true, true);
                 }
             };
             mTelephonyManager.listen(mPhoneStateListener, PhoneStateListener.LISTEN_SERVICE_STATE);
@@ -386,4 +463,30 @@
     protected boolean isGeoCoderImplemented() {
         return Geocoder.isPresent();
     }
+
+    @Override
+    public String toString() {
+        long currentTime = SystemClock.elapsedRealtime();
+        long currentSessionLength = 0;
+        StringBuilder sb = new StringBuilder();
+        sb.append("ComprehensiveCountryDetector{");
+        // The detector hasn't stopped yet --> still running
+        if (mStopTime == 0) {
+            currentSessionLength = currentTime - mStartTime;
+            sb.append("timeRunning=" + currentSessionLength + ", ");
+        } else {
+            // Otherwise, it has already stopped, so take the last session
+            sb.append("lastRunTimeLength=" + (mStopTime - mStartTime) + ", ");
+        }
+        sb.append("totalCountServiceStateChanges=" + mTotalCountServiceStateChanges + ", ");
+        sb.append("currentCountServiceStateChanges=" + mCountServiceStateChanges + ", ");
+        sb.append("totalTime=" + (mTotalTime + currentSessionLength) + ", ");
+        sb.append("currentTime=" + currentTime + ", ");
+        sb.append("countries=");
+        for (Country country : mDebugLogs) {
+            sb.append("\n   " + country.toString());
+        }
+        sb.append("}");
+        return sb.toString();
+    }
 }
diff --git a/services/tests/servicestests/src/com/android/server/location/LocationBasedCountryDetectorTest.java b/services/tests/servicestests/src/com/android/server/location/LocationBasedCountryDetectorTest.java
index 60677df..5f5d668 100755
--- a/services/tests/servicestests/src/com/android/server/location/LocationBasedCountryDetectorTest.java
+++ b/services/tests/servicestests/src/com/android/server/location/LocationBasedCountryDetectorTest.java
@@ -213,7 +213,7 @@
         // QueryThread should be set to NULL
         assertNull(detector.getQueryThread());
         assertTrue(countryListener.notified());
-        assertEquals(countryListener.getCountry(), country);
+        assertEquals("us", countryListener.getCountry().toLowerCase());
     }
 
     public void testFindingCountryCancelled() {
@@ -238,7 +238,7 @@
         // QueryThread should be set to NULL
         assertNull(detector.getQueryThread());
         assertTrue(countryListener.notified());
-        assertEquals(countryListener.getCountry(), country);
+        assertEquals("us", countryListener.getCountry().toLowerCase());
     }
 
     public void testFindingLocationCancelled() {
@@ -339,7 +339,7 @@
         assertNull(detector.getQueryThread());
         // CountryListener should be notified
         assertTrue(countryListener.notified());
-        assertEquals(countryListener.getCountry(), country);
+        assertEquals("us", countryListener.getCountry().toLowerCase());
     }
 
     private void waitForTimerReset(TestCountryDetector detector) {