diff --git a/core/java/android/os/BatteryStats.java b/core/java/android/os/BatteryStats.java
index a49a27a06368b..b706c5c1cae40 100644
--- a/core/java/android/os/BatteryStats.java
+++ b/core/java/android/os/BatteryStats.java
@@ -130,6 +130,7 @@ public abstract class BatteryStats implements Parcelable {
     private static final String MISC_DATA = "m";
     private static final String SCREEN_BRIGHTNESS_DATA = "br";
     private static final String SIGNAL_STRENGTH_TIME_DATA = "sgt";
+    private static final String SIGNAL_SCANNING_TIME_DATA = "sst";
     private static final String SIGNAL_STRENGTH_COUNT_DATA = "sgc";
     private static final String DATA_CONNECTION_TIME_DATA = "dct";
     private static final String DATA_CONNECTION_COUNT_DATA = "dcc";
@@ -439,6 +440,15 @@ public abstract class BatteryStats implements Parcelable {
     public abstract long getPhoneSignalStrengthTime(int strengthBin,
             long batteryRealtime, int which);
 
+    /**
+     * Returns the time in microseconds that the phone has been trying to
+     * acquire a signal.
+     *
+     * {@hide}
+     */
+    public abstract long getPhoneSignalScanningTime(
+            long batteryRealtime, int which);
+
     /**
      * Returns the number of times the phone has entered the given signal strength.
      * 
@@ -823,6 +833,8 @@ public abstract class BatteryStats implements Parcelable {
             args[i] = getPhoneSignalStrengthTime(i, batteryRealtime, which) / 1000;
         }
         dumpLine(pw, 0 /* uid */, category, SIGNAL_STRENGTH_TIME_DATA, args);
+        dumpLine(pw, 0 /* uid */, category, SIGNAL_SCANNING_TIME_DATA,
+                getPhoneSignalScanningTime(batteryRealtime, which) / 1000);
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             args[i] = getPhoneSignalStrengthCount(i, which);
         }
@@ -1130,7 +1142,13 @@ public abstract class BatteryStats implements Parcelable {
         }
         if (!didOne) sb.append("No activity");
         pw.println(sb.toString());
-        
+
+        sb.setLength(0);
+        sb.append(prefix);
+        sb.append("  Signal scanning time: ");
+        formatTimeMs(sb, getPhoneSignalScanningTime(batteryRealtime, which) / 1000);
+        pw.println(sb.toString());
+
         sb.setLength(0);
         sb.append(prefix);
         sb.append("  Radio types: ");
diff --git a/core/java/com/android/internal/app/IBatteryStats.aidl b/core/java/com/android/internal/app/IBatteryStats.aidl
index 4bac5933d7ed7..d5ccdeb3bfeb2 100644
--- a/core/java/com/android/internal/app/IBatteryStats.aidl
+++ b/core/java/com/android/internal/app/IBatteryStats.aidl
@@ -37,7 +37,7 @@ interface IBatteryStats {
     void notePhoneOff();
     void notePhoneSignalStrength(in SignalStrength signalStrength);
     void notePhoneDataConnectionState(int dataType, boolean hasData);
-    void noteAirplaneMode(boolean isAirplaneMode);
+    void notePhoneState(int phoneState);
     void noteWifiOn(int uid);
     void noteWifiOff(int uid);
     void noteWifiRunning();
diff --git a/core/java/com/android/internal/os/BatteryStatsImpl.java b/core/java/com/android/internal/os/BatteryStatsImpl.java
index 4b26b8f5552f8..8698cb7c818b8 100644
--- a/core/java/com/android/internal/os/BatteryStatsImpl.java
+++ b/core/java/com/android/internal/os/BatteryStatsImpl.java
@@ -24,6 +24,7 @@ import android.os.ParcelFormatException;
 import android.os.Parcelable;
 import android.os.Process;
 import android.os.SystemClock;
+import android.telephony.ServiceState;
 import android.telephony.SignalStrength;
 import android.telephony.TelephonyManager;
 import android.util.Log;
@@ -56,7 +57,7 @@ public final class BatteryStatsImpl extends BatteryStats {
     private static final int MAGIC = 0xBA757475; // 'BATSTATS' 
 
     // Current on-disk Parcel version
-    private static final int VERSION = 40;
+    private static final int VERSION = 41;
 
     private static int sNumSpeedSteps;
 
@@ -117,7 +118,9 @@ public final class BatteryStatsImpl extends BatteryStats {
     int mPhoneSignalStrengthBin = -1;
     final StopwatchTimer[] mPhoneSignalStrengthsTimer = 
             new StopwatchTimer[NUM_SIGNAL_STRENGTH_BINS];
-    
+
+    StopwatchTimer mPhoneSignalScanningTimer;
+
     int mPhoneDataConnectionType = -1;
     final StopwatchTimer[] mPhoneDataConnectionsTimer = 
             new StopwatchTimer[NUM_DATA_CONNECTION_TYPES];
@@ -169,6 +172,8 @@ public final class BatteryStatsImpl extends BatteryStats {
     private int mBluetoothPingCount;
     private int mBluetoothPingStart = -1;
 
+    private int mPhoneServiceState = -1;
+
     /*
      * Holds a SamplingTimer associated with each kernel wakelock name being tracked.
      */
@@ -681,6 +686,8 @@ public final class BatteryStatsImpl extends BatteryStats {
          */
         long mAcquireTime;
 
+        long mTimeout;
+
         StopwatchTimer(int type, ArrayList<StopwatchTimer> timerPool,
                 ArrayList<Unpluggable> unpluggables, Parcel in) {
             super(type, unpluggables, in);
@@ -694,6 +701,10 @@ public final class BatteryStatsImpl extends BatteryStats {
             mTimerPool = timerPool;
         }
         
+        void setTimeout(long timeout) {
+            mTimeout = timeout;
+        }
+
         public void writeToParcel(Parcel out, long batteryRealtime) {
             super.writeToParcel(out, batteryRealtime);
             out.writeLong(mUpdateTime);
@@ -797,6 +808,9 @@ public final class BatteryStatsImpl extends BatteryStats {
 
         @Override
         protected long computeRunTimeLocked(long curBatteryRealtime) {
+            if (mTimeout > 0 && curBatteryRealtime > mUpdateTime + mTimeout) {
+                curBatteryRealtime = mUpdateTime + mTimeout;
+            }
             return mTotalTime + (mNesting > 0
                     ? (curBatteryRealtime - mUpdateTime)
                             / (mTimerPool != null ? mTimerPool.size() : 1)
@@ -1123,34 +1137,59 @@ public final class BatteryStatsImpl extends BatteryStats {
         }
     }
 
-    public void noteAirplaneModeLocked(boolean isAirplaneMode) {
-        final int bin = mPhoneSignalStrengthBin;
-        if (bin >= 0) {
-            if (!isAirplaneMode) {
-                if (!mPhoneSignalStrengthsTimer[bin].isRunningLocked()) {
-                    mPhoneSignalStrengthsTimer[bin].startRunningLocked(this);
-                }
-            } else {
-                for (int i = 0; i < NUM_SIGNAL_STRENGTH_BINS; i++) {
-                    while (mPhoneSignalStrengthsTimer[i].isRunningLocked()) {
-                        mPhoneSignalStrengthsTimer[i].stopRunningLocked(this);
-                    }
+    /**
+     * Telephony stack updates the phone state.
+     * @param state phone state from ServiceState.getState()
+     */
+    public void notePhoneStateLocked(int state) {
+        int bin = mPhoneSignalStrengthBin;
+        boolean isAirplaneMode = state == ServiceState.STATE_POWER_OFF;
+        // Stop all timers
+        if (isAirplaneMode || state == ServiceState.STATE_OUT_OF_SERVICE) {
+            for (int i = 0; i < NUM_SIGNAL_STRENGTH_BINS; i++) {
+                while (mPhoneSignalStrengthsTimer[i].isRunningLocked()) {
+                    mPhoneSignalStrengthsTimer[i].stopRunningLocked(this);
                 }
             }
         }
+        // Stop Signal Scanning timer, in case we're going into service
+        while (mPhoneSignalScanningTimer.isRunningLocked()) {
+            mPhoneSignalScanningTimer.stopRunningLocked(this);
+        }
+
+        // If we're back in service or continuing in service, restart the old timer.
+        if (state == ServiceState.STATE_IN_SERVICE) {
+            if (bin == -1) bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+            if (!mPhoneSignalStrengthsTimer[bin].isRunningLocked()) {
+                mPhoneSignalStrengthsTimer[bin].startRunningLocked(this);
+            }
+        } else if (state == ServiceState.STATE_OUT_OF_SERVICE) {
+            mPhoneSignalStrengthBin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+            if (!mPhoneSignalStrengthsTimer[mPhoneSignalStrengthBin].isRunningLocked()) {
+                mPhoneSignalStrengthsTimer[mPhoneSignalStrengthBin].startRunningLocked(this);
+            }
+            if (!mPhoneSignalScanningTimer.isRunningLocked()) {
+                mPhoneSignalScanningTimer.startRunningLocked(this);
+            }
+        }
+        mPhoneServiceState = state;
     }
 
     public void notePhoneSignalStrengthLocked(SignalStrength signalStrength) {
         // Bin the strength.
         int bin;
-
+        if (mPhoneServiceState == ServiceState.STATE_POWER_OFF
+                || mPhoneServiceState == ServiceState.STATE_OUT_OF_SERVICE) {
+            // Ignore any signal strength changes when radio was turned off or out of service.
+            return;
+        }
         if (!signalStrength.isGsm()) {
             int dBm = signalStrength.getCdmaDbm();
-            if (dBm >= -75) bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
-            else if (dBm >= -85) bin = SIGNAL_STRENGTH_GREAT;
-            else if (dBm >= -95)  bin = SIGNAL_STRENGTH_GOOD;
-            else if (dBm >= -100)  bin = SIGNAL_STRENGTH_MODERATE;
-            else bin = SIGNAL_STRENGTH_POOR;
+            if (dBm >= -75) bin = SIGNAL_STRENGTH_GREAT;
+            else if (dBm >= -85) bin = SIGNAL_STRENGTH_GOOD;
+            else if (dBm >= -95)  bin = SIGNAL_STRENGTH_MODERATE;
+            else if (dBm >= -100)  bin = SIGNAL_STRENGTH_POOR;
+            else bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
         } else {
             int asu = signalStrength.getGsmSignalStrength();
             if (asu < 0 || asu >= 99) bin = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
@@ -1328,7 +1367,13 @@ public final class BatteryStatsImpl extends BatteryStats {
         return mPhoneSignalStrengthsTimer[strengthBin].getTotalTimeLocked(
                 batteryRealtime, which);
     }
-    
+
+    @Override public long getPhoneSignalScanningTime(
+            long batteryRealtime, int which) {
+        return mPhoneSignalScanningTimer.getTotalTimeLocked(
+                batteryRealtime, which);
+    }
+
     @Override public int getPhoneSignalStrengthCount(int dataType, int which) {
         return mPhoneDataConnectionsTimer[dataType].getCountLocked(which);
     }
@@ -2653,6 +2698,7 @@ public final class BatteryStatsImpl extends BatteryStats {
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             mPhoneSignalStrengthsTimer[i] = new StopwatchTimer(-200-i, null, mUnpluggables);
         }
+        mPhoneSignalScanningTimer = new StopwatchTimer(-200+1, null, mUnpluggables);
         for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
             mPhoneDataConnectionsTimer[i] = new StopwatchTimer(-300-i, null, mUnpluggables);
         }
@@ -2679,6 +2725,12 @@ public final class BatteryStatsImpl extends BatteryStats {
         if (sNumSpeedSteps == 0) sNumSpeedSteps = steps;
     }
 
+    public void setRadioScanningTimeout(long timeout) {
+        if (mPhoneSignalScanningTimer != null) {
+            mPhoneSignalScanningTimer.setTimeout(timeout);
+        }
+    }
+
     @Override
     public int getStartCount() {
         return mStartCount;
@@ -3114,6 +3166,7 @@ public final class BatteryStatsImpl extends BatteryStats {
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             mPhoneSignalStrengthsTimer[i].readSummaryFromParcelLocked(in);
         }
+        mPhoneSignalScanningTimer.readSummaryFromParcelLocked(in);
         for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
             mPhoneDataConnectionsTimer[i].readSummaryFromParcelLocked(in);
         }
@@ -3257,6 +3310,7 @@ public final class BatteryStatsImpl extends BatteryStats {
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             mPhoneSignalStrengthsTimer[i].writeSummaryFromParcelLocked(out, NOWREAL);
         }
+        mPhoneSignalScanningTimer.writeSummaryFromParcelLocked(out, NOWREAL);
         for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
             mPhoneDataConnectionsTimer[i].writeSummaryFromParcelLocked(out, NOWREAL);
         }
@@ -3418,6 +3472,7 @@ public final class BatteryStatsImpl extends BatteryStats {
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             mPhoneSignalStrengthsTimer[i] = new StopwatchTimer(-200-i, null, mUnpluggables, in);
         }
+        mPhoneSignalScanningTimer = new StopwatchTimer(-200+1, null, mUnpluggables, in);
         for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
             mPhoneDataConnectionsTimer[i] = new StopwatchTimer(-300-i, null, mUnpluggables, in);
         }
@@ -3513,6 +3568,7 @@ public final class BatteryStatsImpl extends BatteryStats {
         for (int i=0; i<NUM_SIGNAL_STRENGTH_BINS; i++) {
             mPhoneSignalStrengthsTimer[i].writeToParcel(out, batteryRealtime);
         }
+        mPhoneSignalScanningTimer.writeToParcel(out, batteryRealtime);
         for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
             mPhoneDataConnectionsTimer[i].writeToParcel(out, batteryRealtime);
         }
@@ -3598,6 +3654,8 @@ public final class BatteryStatsImpl extends BatteryStats {
                 pr.println("*** Signal strength #" + i + ":");
                 mPhoneSignalStrengthsTimer[i].logState(pr, "  ");
             }
+            pr.println("*** Signal scanning :");
+            mPhoneSignalScanningTimer.logState(pr, "  ");
             for (int i=0; i<NUM_DATA_CONNECTION_TYPES; i++) {
                 pr.println("*** Data connection type #" + i + ":");
                 mPhoneDataConnectionsTimer[i].logState(pr, "  ");
diff --git a/core/java/com/android/internal/os/PowerProfile.java b/core/java/com/android/internal/os/PowerProfile.java
index 4b4b71782552a..2369d25bd4728 100644
--- a/core/java/com/android/internal/os/PowerProfile.java
+++ b/core/java/com/android/internal/os/PowerProfile.java
@@ -96,6 +96,11 @@ public class PowerProfile {
      */
     public static final String POWER_RADIO_ON = "radio.on";
 
+    /**
+     * Power consumption when cell radio is hunting for a signal.
+     */
+    public static final String POWER_RADIO_SCANNING = "radio.scanning";
+
     /**
      * Power consumption when talking on the phone.
      */
diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 45fcaa59e8405..780f6118188f6 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -40,6 +40,10 @@
     <!-- The duration (in milliseconds) of a long animation. -->
     <integer name="config_longAnimTime">400</integer>
 
+    <!-- The duration (in milliseconds) that the radio will scan for a signal
+         when there's no network connection. If the scan doesn't timeout, use zero -->
+    <integer name="config_radioScanningTimeout">0</integer>
+
     <!-- XXXXX NOTE THE FOLLOWING RESOURCES USE THE WRONG NAMING CONVENTION.
          Please don't copy them, copy anything else. -->
          
diff --git a/core/res/res/xml/power_profile.xml b/core/res/res/xml/power_profile.xml
index 710b71ea7e75c..ce623e8d4d359 100644
--- a/core/res/res/xml/power_profile.xml
+++ b/core/res/res/xml/power_profile.xml
@@ -29,10 +29,12 @@
   <item name="dsp.audio">0.1</item>
   <item name="dsp.video">0.1</item>
   <item name="radio.active">1</item>
+  <!-- The current consumed by the radio when it is scanning for a signal -->
+  <item name="radio.scanning">0.5</item>
   <item name="gps.on">1</item>
   <!-- Current consumed by the radio at different signal strengths, when paging -->
   <array name="radio.on"> <!-- Strength 0 to BINS-1 -->
-      <value>1</value>
+      <value>0.2</value>
       <value>0.1</value>
   </array>
   <!-- Different CPU speeds as reported in
diff --git a/services/java/com/android/server/TelephonyRegistry.java b/services/java/com/android/server/TelephonyRegistry.java
index 101b075e22560..47cb6adce87a4 100644
--- a/services/java/com/android/server/TelephonyRegistry.java
+++ b/services/java/com/android/server/TelephonyRegistry.java
@@ -477,7 +477,7 @@ class TelephonyRegistry extends ITelephonyRegistry.Stub {
     private void broadcastServiceStateChanged(ServiceState state) {
         long ident = Binder.clearCallingIdentity();
         try {
-            mBatteryStats.noteAirplaneMode(state.getState() == ServiceState.STATE_POWER_OFF);
+            mBatteryStats.notePhoneState(state.getState());
         } catch (RemoteException re) {
             // Can't do much
         } finally {
diff --git a/services/java/com/android/server/am/BatteryStatsService.java b/services/java/com/android/server/am/BatteryStatsService.java
index 61537f56155f5..5a1619a23fd57 100644
--- a/services/java/com/android/server/am/BatteryStatsService.java
+++ b/services/java/com/android/server/am/BatteryStatsService.java
@@ -51,6 +51,9 @@ public final class BatteryStatsService extends IBatteryStats.Stub {
         mContext = context;
         ServiceManager.addService("batteryinfo", asBinder());
         mStats.setNumSpeedSteps(new PowerProfile(mContext).getNumSpeedSteps());
+        mStats.setRadioScanningTimeout(mContext.getResources().getInteger(
+                com.android.internal.R.integer.config_radioScanningTimeout)
+                * 1000L);
     }
     
     public void shutdown() {
@@ -195,10 +198,10 @@ public final class BatteryStatsService extends IBatteryStats.Stub {
         }
     }
 
-    public void noteAirplaneMode(boolean airplaneMode) {
+    public void notePhoneState(int state) {
         enforceCallingPermission();
         synchronized (mStats) {
-            mStats.noteAirplaneModeLocked(airplaneMode);
+            mStats.notePhoneStateLocked(state);
         }
     }