diff --git a/core/java/android/telephony/PhoneStateListener.java b/core/java/android/telephony/PhoneStateListener.java
index 1d0b4a0ca20af..4591fafc696ec 100644
--- a/core/java/android/telephony/PhoneStateListener.java
+++ b/core/java/android/telephony/PhoneStateListener.java
@@ -168,9 +168,11 @@ public class PhoneStateListener {
     public static final int LISTEN_SIGNAL_STRENGTHS                         = 0x00000100;
 
     /**
-     * Listen for always reported changes of the network signal strengths (cellular),
+     * Listen for changes of the network signal strengths (cellular) always reported from modem,
      * even in some situations such as the screen of the device is off.
      *
+     * @see #onSignalStrengthsChanged
+     *
      * @hide
      */
     @RequiresPermission(android.Manifest.permission.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH)
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index 5a5a7576484e4..09eece8a4746b 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -211,6 +211,9 @@
     <!-- Permission required for CTS test - CrossProfileAppsHostSideTest -->
     <uses-permission android:name="android.permission.INTERACT_ACROSS_PROFILES"/>
 
+    <!-- permissions required for CTS test - PhoneStateListenerTest -->
+    <uses-permission android:name="android.permission.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH" />
+
     <!-- Permission required for CTS test - UiModeManagerTest -->
     <uses-permission android:name="android.permission.ENTER_CAR_MODE_PRIORITIZED"/>
 
diff --git a/services/core/java/com/android/server/TelephonyRegistry.java b/services/core/java/com/android/server/TelephonyRegistry.java
index a10d57a25f985..f0a3bfd6b3190 100644
--- a/services/core/java/com/android/server/TelephonyRegistry.java
+++ b/services/core/java/com/android/server/TelephonyRegistry.java
@@ -891,6 +891,13 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                     if ((events & PhoneStateListener.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH)
                             != 0) {
                         updateReportSignalStrengthDecision(r.subId);
+                        try {
+                            if (mSignalStrength[phoneId] != null) {
+                                r.callback.onSignalStrengthsChanged(mSignalStrength[phoneId]);
+                            }
+                        } catch (RemoteException ex) {
+                            remove(r.binder);
+                        }
                     }
                     if (validateEventsAndUserLocked(r, PhoneStateListener.LISTEN_CELL_INFO)) {
                         try {
@@ -1307,9 +1314,10 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                         log("notifySignalStrengthForPhoneId: r=" + r + " subId=" + subId
                                 + " phoneId=" + phoneId + " ss=" + signalStrength);
                     }
-                    if (r.matchPhoneStateListenerEvent(
-                                PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) &&
-                            idMatch(r.subId, subId, phoneId)) {
+                    if ((r.matchPhoneStateListenerEvent(PhoneStateListener.LISTEN_SIGNAL_STRENGTHS)
+                            || r.matchPhoneStateListenerEvent(
+                                    PhoneStateListener.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH))
+                            && idMatch(r.subId, subId, phoneId)) {
                         try {
                             if (DBG) {
                                 log("notifySignalStrengthForPhoneId: callback.onSsS r=" + r
@@ -1322,7 +1330,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                         }
                     }
                     if (r.matchPhoneStateListenerEvent(PhoneStateListener.LISTEN_SIGNAL_STRENGTH) &&
-                            idMatch(r.subId, subId, phoneId)){
+                            idMatch(r.subId, subId, phoneId)) {
                         try {
                             int gsmSignalStrength = signalStrength.getGsmSignalStrength();
                             int ss = (gsmSignalStrength == 99 ? -1 : gsmSignalStrength);
@@ -2454,6 +2462,11 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
                     android.Manifest.permission.READ_ACTIVE_EMERGENCY_SESSION, null);
         }
 
+        if ((events & PhoneStateListener.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH) != 0) {
+            mContext.enforceCallingOrSelfPermission(
+                    android.Manifest.permission.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH, null);
+        }
+
         if ((events & READ_PRIVILEGED_PHONE_STATE_PERMISSION_MASK) != 0) {
             mContext.enforceCallingOrSelfPermission(
                     android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, null);
@@ -2569,7 +2582,8 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
             }
         }
 
-        if ((events & PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) != 0) {
+        if ((events & PhoneStateListener.LISTEN_SIGNAL_STRENGTHS) != 0
+                || (events & PhoneStateListener.LISTEN_ALWAYS_REPORTED_SIGNAL_STRENGTH) != 0) {
             try {
                 if (mSignalStrength[phoneId] != null) {
                     SignalStrength signalStrength = mSignalStrength[phoneId];