diff --git a/src/com/android/settings/network/ActiveSubsciptionsListener.java b/src/com/android/settings/network/ActiveSubsciptionsListener.java
index cb3e061..d9d0bb5 100644
--- a/src/com/android/settings/network/ActiveSubsciptionsListener.java
+++ b/src/com/android/settings/network/ActiveSubsciptionsListener.java
@@ -20,6 +20,8 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.os.Handler;
+import android.os.Looper;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
@@ -31,6 +33,7 @@
 import com.android.internal.telephony.TelephonyIntents;
 
 import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * A listener for active subscription change
@@ -43,18 +46,26 @@
     /**
      * Constructor
      *
-     * @param context of this listener
+     * @param looper {@code Looper} of this listener
+     * @param context {@code Context} of this listener
      */
-    public ActiveSubsciptionsListener(Context context) {
+    public ActiveSubsciptionsListener(Looper looper, Context context) {
+        mLooper = looper;
         mContext = context;
 
+        mCacheState = new AtomicInteger(STATE_NOT_LISTENING);
+        mMaxActiveSubscriptionInfos = new AtomicInteger(MAX_SUBSCRIPTION_UNKNOWN);
+
         mSubscriptionChangeIntentFilter = new IntentFilter();
         mSubscriptionChangeIntentFilter.addAction(
                 CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED);
         mSubscriptionChangeIntentFilter.addAction(
                 TelephonyIntents.ACTION_RADIO_TECHNOLOGY_CHANGED);
+    }
 
-        mSubscriptionChangeReceiver = new BroadcastReceiver() {
+    @VisibleForTesting
+    BroadcastReceiver getSubscriptionChangeReceiver() {
+        return new BroadcastReceiver() {
             @Override
             public void onReceive(Context context, Intent intent) {
                 if (isInitialStickyBroadcast()) {
@@ -77,18 +88,24 @@
         };
     }
 
+    private Looper mLooper;
     private Context mContext;
 
-    private boolean mIsMonitoringDataChange;
-    private boolean mIsCachedDataAvailable;
+    private static final int STATE_NOT_LISTENING = 0;
+    private static final int STATE_STOPPING      = 1;
+    private static final int STATE_PREPARING     = 2;
+    private static final int STATE_LISTENING     = 3;
+    private static final int STATE_DATA_CACHED   = 4;
+
+    private AtomicInteger mCacheState;
     private SubscriptionManager mSubscriptionManager;
 
     private IntentFilter mSubscriptionChangeIntentFilter;
+    private BroadcastReceiver mSubscriptionChangeReceiver;
 
-    @VisibleForTesting
-    BroadcastReceiver mSubscriptionChangeReceiver;
+    private static final int MAX_SUBSCRIPTION_UNKNOWN = -1;
 
-    private Integer mMaxActiveSubscriptionInfos;
+    private AtomicInteger mMaxActiveSubscriptionInfos;
     private List<SubscriptionInfo> mCachedActiveSubscriptionInfo;
 
     /**
@@ -135,16 +152,14 @@
      * @return max. number of active subscription info(s)
      */
     public int getActiveSubscriptionInfoCountMax() {
-        int count = 0;
-        if (mMaxActiveSubscriptionInfos == null) {
-            count = getSubscriptionManager().getActiveSubscriptionInfoCountMax();
-            if (mIsMonitoringDataChange) {
-                mMaxActiveSubscriptionInfos = count;
-            }
-        } else {
-            count = mMaxActiveSubscriptionInfos.intValue();
+        int cacheState = mCacheState.get();
+        if (cacheState < STATE_LISTENING) {
+            return getSubscriptionManager().getActiveSubscriptionInfoCountMax();
         }
-        return count;
+
+        mMaxActiveSubscriptionInfos.compareAndSet(MAX_SUBSCRIPTION_UNKNOWN,
+                getSubscriptionManager().getActiveSubscriptionInfoCountMax());
+        return mMaxActiveSubscriptionInfos.get();
     }
 
     /**
@@ -153,11 +168,11 @@
      * @return A list of active subscription info
      */
     public List<SubscriptionInfo> getActiveSubscriptionsInfo() {
-        if (mIsCachedDataAvailable) {
+        if (mCacheState.get() >= STATE_DATA_CACHED) {
             return mCachedActiveSubscriptionInfo;
         }
-        mIsCachedDataAvailable = mIsMonitoringDataChange;
         mCachedActiveSubscriptionInfo = getSubscriptionManager().getActiveSubscriptionInfoList();
+        mCacheState.compareAndSet(STATE_LISTENING, STATE_DATA_CACHED);
 
         if ((mCachedActiveSubscriptionInfo == null)
                 || (mCachedActiveSubscriptionInfo.size() <= 0)) {
@@ -208,7 +223,7 @@
      * @return A subscription info which is accessible list
      */
     public SubscriptionInfo getAccessibleSubscriptionInfo(int subId) {
-        if (mIsCachedDataAvailable) {
+        if (mCacheState.get() >= STATE_DATA_CACHED) {
             final SubscriptionInfo activeSubInfo = getActiveSubscriptionInfo(subId);
             if (activeSubInfo != null) {
                 return activeSubInfo;
@@ -231,37 +246,49 @@
      * Clear data cached within listener
      */
     public void clearCache() {
-        mIsCachedDataAvailable = false;
-        mMaxActiveSubscriptionInfos = null;
+        mMaxActiveSubscriptionInfos.set(MAX_SUBSCRIPTION_UNKNOWN);
+        mCacheState.compareAndSet(STATE_DATA_CACHED, STATE_LISTENING);
         mCachedActiveSubscriptionInfo = null;
     }
 
     private void monitorSubscriptionsChange(boolean on) {
-        if (mIsMonitoringDataChange == on) {
+        if (on) {
+            if (!mCacheState.compareAndSet(STATE_NOT_LISTENING, STATE_PREPARING)) {
+                return;
+            }
+
+            if (mSubscriptionChangeReceiver == null) {
+                mSubscriptionChangeReceiver = getSubscriptionChangeReceiver();
+            }
+            mContext.registerReceiver(mSubscriptionChangeReceiver,
+                    mSubscriptionChangeIntentFilter, null, new Handler(mLooper));
+            getSubscriptionManager().addOnSubscriptionsChangedListener(this);
+            mCacheState.compareAndSet(STATE_PREPARING, STATE_LISTENING);
             return;
         }
-        mIsMonitoringDataChange = on;
-        if (on) {
-            mContext.registerReceiver(mSubscriptionChangeReceiver,
-                    mSubscriptionChangeIntentFilter);
-            getSubscriptionManager().addOnSubscriptionsChangedListener(this);
-            listenerNotify();
-        } else {
-            mContext.unregisterReceiver(mSubscriptionChangeReceiver);
-            getSubscriptionManager().removeOnSubscriptionsChangedListener(this);
-            clearCache();
+
+        final int currentState = mCacheState.getAndSet(STATE_STOPPING);
+        if (currentState <= STATE_STOPPING) {
+            mCacheState.compareAndSet(STATE_STOPPING, currentState);
+            return;
         }
+        if (mSubscriptionChangeReceiver != null) {
+            mContext.unregisterReceiver(mSubscriptionChangeReceiver);
+        }
+        getSubscriptionManager().removeOnSubscriptionsChangedListener(this);
+        clearCache();
+        mCacheState.compareAndSet(STATE_STOPPING, STATE_NOT_LISTENING);
     }
 
     private void listenerNotify() {
-        if (!mIsMonitoringDataChange) {
+        if (mCacheState.get() < STATE_LISTENING) {
             return;
         }
         onChanged();
     }
 
     private boolean clearCachedSubId(int subId) {
-        if (!mIsCachedDataAvailable) {
+        if (mCacheState.get() < STATE_DATA_CACHED) {
             return false;
         }
         if (mCachedActiveSubscriptionInfo == null) {
diff --git a/src/com/android/settings/network/GlobalSettingsChangeListener.java b/src/com/android/settings/network/GlobalSettingsChangeListener.java
index 89d374b..4c58c60 100644
--- a/src/com/android/settings/network/GlobalSettingsChangeListener.java
+++ b/src/com/android/settings/network/GlobalSettingsChangeListener.java
@@ -24,12 +24,15 @@
 import android.database.ContentObserver;
 import android.net.Uri;
 import android.os.Handler;
+import android.os.Looper;
 import android.provider.Settings;
 
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.OnLifecycleEvent;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 /**
  * A listener for Settings.Global configuration change, with support of Lifecycle
  */
@@ -39,19 +42,33 @@
     /**
      * Constructor
      *
-     * @param context of this listener
+     * @param context {@code Context} of this listener
      * @param field field of Global Settings
      */
     public GlobalSettingsChangeListener(Context context, String field) {
-        super(new Handler());
+        this(Looper.getMainLooper(), context, field);
+    }
+
+    /**
+     * Constructor
+     *
+     * @param looper {@code Looper} for processing callback
+     * @param context {@code Context} of this listener
+     * @param field field of Global Settings
+     */
+    public GlobalSettingsChangeListener(Looper looper, Context context, String field) {
+        super(new Handler(looper));
         mContext = context;
         mField = field;
+        mUri = Settings.Global.getUriFor(field);
+        mListening = new AtomicBoolean(false);
         monitorUri(true);
     }
 
     private Context mContext;
     private String mField;
     private Uri mUri;
+    private AtomicBoolean mListening;
     private Lifecycle mLifecycle;
 
     /**
@@ -75,7 +92,7 @@
     }
 
     public void onChange(boolean selfChange) {
-        if (!isMonitoring()) {
+        if (!mListening.get()) {
             return;
         }
         onChanged(mField);
@@ -104,20 +121,16 @@
         notifyChangeBasedOn(null);
     }
 
-    private boolean isMonitoring() {
-        return (mUri != null);
-    }
-
     private void monitorUri(boolean on) {
-        if (isMonitoring() == on) {
+        if (!mListening.compareAndSet(!on, on)) {
             return;
         }
-        if (mUri == null) {
-            mUri = Settings.Global.getUriFor(mField);
+
+        if (on) {
             mContext.getContentResolver().registerContentObserver(mUri, false, this);
             return;
         }
-        mUri = null;
+
         mContext.getContentResolver().unregisterContentObserver(this);
     }
 }
diff --git a/src/com/android/settings/network/ProxySubscriptionManager.java b/src/com/android/settings/network/ProxySubscriptionManager.java
index 18b4ac9..8f3f385 100644
--- a/src/com/android/settings/network/ProxySubscriptionManager.java
+++ b/src/com/android/settings/network/ProxySubscriptionManager.java
@@ -21,6 +21,7 @@
 import static androidx.lifecycle.Lifecycle.Event.ON_STOP;
 
 import android.content.Context;
+import android.os.Looper;
 import android.provider.Settings;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
@@ -71,18 +72,18 @@
     private static ProxySubscriptionManager sSingleton;
 
     private ProxySubscriptionManager(Context context) {
-        mContext = context;
+        final Looper looper = Looper.getMainLooper();
 
         mActiveSubscriptionsListeners =
                 new ArrayList<OnActiveSubscriptionChangedListener>();
 
-        mSubsciptionsMonitor = new ActiveSubsciptionsListener(context) {
+        mSubsciptionsMonitor = new ActiveSubsciptionsListener(looper, context) {
             public void onChanged() {
                 notifyAllListeners();
             }
         };
-        mAirplaneModeMonitor = new GlobalSettingsChangeListener(context,
-                Settings.Global.AIRPLANE_MODE_ON) {
+        mAirplaneModeMonitor = new GlobalSettingsChangeListener(looper,
+                context, Settings.Global.AIRPLANE_MODE_ON) {
             public void onChanged(String field) {
                 mSubsciptionsMonitor.clearCache();
                 notifyAllListeners();
@@ -93,7 +94,6 @@
     }
 
     private Lifecycle mLifecycle;
-    private Context mContext;
     private ActiveSubsciptionsListener mSubsciptionsMonitor;
     private GlobalSettingsChangeListener mAirplaneModeMonitor;
 
@@ -140,7 +140,7 @@
 
     @OnLifecycleEvent(ON_DESTROY)
     void onDestroy() {
-        mSubsciptionsMonitor.stop();
+        mAirplaneModeMonitor.close();
 
         if (mLifecycle != null) {
             mLifecycle.removeObserver(this);
diff --git a/tests/robotests/src/com/android/settings/network/ActiveSubsciptionsListenerTest.java b/tests/robotests/src/com/android/settings/network/ActiveSubsciptionsListenerTest.java
index e124eb7..7f23699 100644
--- a/tests/robotests/src/com/android/settings/network/ActiveSubsciptionsListenerTest.java
+++ b/tests/robotests/src/com/android/settings/network/ActiveSubsciptionsListenerTest.java
@@ -16,111 +16,157 @@
 
 package com.android.settings.network;
 
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.atLeastOnce;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
+import static org.robolectric.Shadows.shadowOf;
 
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.os.Looper;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionInfo;
 import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyManager;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import com.android.internal.telephony.TelephonyIntents;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
-import org.robolectric.RobolectricTestRunner;
 import org.robolectric.RuntimeEnvironment;
+import org.robolectric.shadow.api.Shadow;
+import org.robolectric.shadows.ShadowBroadcastReceiver;
+import org.robolectric.shadows.ShadowContextImpl;
+import org.robolectric.shadows.ShadowSubscriptionManager;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicBoolean;
 
-@RunWith(RobolectricTestRunner.class)
+@RunWith(AndroidJUnit4.class)
 public class ActiveSubsciptionsListenerTest {
+    private static final int SUB_ID1 = 3;
+    private static final int SUB_ID2 = 7;
 
-    @Mock
-    private SubscriptionManager mSubscriptionManager;
-    @Mock
-    private SubscriptionInfo mSubscriptionInfo1;
-    @Mock
-    private SubscriptionInfo mSubscriptionInfo2;
+    private static final Intent INTENT_RADIO_TECHNOLOGY_CHANGED =
+            new Intent(TelephonyIntents.ACTION_RADIO_TECHNOLOGY_CHANGED);
+
+    private static final Intent INTENT_MULTI_SIM_CONFIG_CHANGED =
+            new Intent(TelephonyManager.ACTION_MULTI_SIM_CONFIG_CHANGED);
+
+    private static final Intent INTENT_CARRIER_CONFIG_CHANGED =
+            new Intent(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED);
 
     private Context mContext;
-    private ActiveSubsciptionsListener mListener;
+    private ShadowContextImpl mShadowContextImpl;
+    private SubscriptionManager mSubscriptionManager;
+    private ShadowSubscriptionManager mShadowSubscriptionManager;
     private List<SubscriptionInfo> mActiveSubscriptions;
-    private BroadcastReceiver mSubscriptionChangeReceiver;
+
+    private ActiveSubsciptionsListenerImpl mListener;
+    private BroadcastReceiver mReceiver;
+    private ShadowBroadcastReceiver mShadowReceiver;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        mContext = spy(RuntimeEnvironment.application);
-        when(mContext.getSystemService(SubscriptionManager.class)).thenReturn(mSubscriptionManager);
+
+        mContext = RuntimeEnvironment.application.getBaseContext();
+        mShadowContextImpl = Shadow.extract(mContext);
+
+        mSubscriptionManager = spy(mContext.getSystemService(SubscriptionManager.class));
+        mShadowSubscriptionManager = shadowOf(mSubscriptionManager);
+
         mActiveSubscriptions = new ArrayList<SubscriptionInfo>();
+        mActiveSubscriptions.add(ShadowSubscriptionManager.SubscriptionInfoBuilder
+                .newBuilder().setId(SUB_ID1).buildSubscriptionInfo());
+        mActiveSubscriptions.add(ShadowSubscriptionManager.SubscriptionInfoBuilder
+                .newBuilder().setId(SUB_ID2).buildSubscriptionInfo());
+        mShadowSubscriptionManager.setActiveSubscriptionInfoList(mActiveSubscriptions);
+
+        mListener = spy(new ActiveSubsciptionsListenerImpl(Looper.getMainLooper(), mContext));
+        doReturn(mSubscriptionManager).when(mListener).getSubscriptionManager();
+        mReceiver = mListener.getSubscriptionChangeReceiver();
+        mShadowReceiver = shadowOf(mReceiver);
+        doReturn(mReceiver).when(mListener).getSubscriptionChangeReceiver();
+    }
+
+    @After
+    public void cleanUp() {
+        mListener.stop();
+    }
+
+    private class ActiveSubsciptionsListenerImpl extends ActiveSubsciptionsListener {
+        private ActiveSubsciptionsListenerImpl(Looper looper, Context context) {
+            super(looper, context);
+        }
+        public void onChanged() {}
+    }
+
+    private void sendIntentToReceiver(Intent intent) {
+        mShadowReceiver.onReceive(mContext, intent, new AtomicBoolean(false));
     }
 
     @Test
     public void constructor_noListeningWasSetup() {
-        mListener = spy(new ActiveSubsciptionsListener(mContext) {
-            public void onChanged() {}
-        });
-        verify(mSubscriptionManager, never()).addOnSubscriptionsChangedListener(any());
-        verify(mContext, never()).registerReceiver(any(), any());
         verify(mListener, never()).onChanged();
     }
 
     @Test
-    public void start_onChangedShouldAlwaysBeCalled() {
-        mListener = spy(new ActiveSubsciptionsListener(mContext) {
-            public void onChanged() {}
-        });
-        mSubscriptionChangeReceiver = spy(mListener.mSubscriptionChangeReceiver);
-        when(mSubscriptionChangeReceiver.isInitialStickyBroadcast()).thenReturn(false);
-
-        mActiveSubscriptions.add(mSubscriptionInfo1);
-        mActiveSubscriptions.add(mSubscriptionInfo2);
-        when(mSubscriptionManager.getActiveSubscriptionInfoList()).thenReturn(mActiveSubscriptions);
-
-        final Intent intentSubscription =
-                new Intent(CarrierConfigManager.ACTION_CARRIER_CONFIG_CHANGED);
-        final Intent intentRadioTech =
-                new Intent(TelephonyIntents.ACTION_RADIO_TECHNOLOGY_CHANGED);
-
-        mSubscriptionChangeReceiver.onReceive(mContext, intentSubscription);
-        mSubscriptionChangeReceiver.onReceive(mContext, intentRadioTech);
+    public void start_configChangedIntent_onChangedShouldBeCalled() {
+        sendIntentToReceiver(INTENT_RADIO_TECHNOLOGY_CHANGED);
+        sendIntentToReceiver(INTENT_MULTI_SIM_CONFIG_CHANGED);
         verify(mListener, never()).onChanged();
 
         mListener.start();
 
-        mSubscriptionChangeReceiver.onReceive(mContext, intentSubscription);
-        verify(mListener, atLeastOnce()).onChanged();
+        sendIntentToReceiver(INTENT_RADIO_TECHNOLOGY_CHANGED);
+        verify(mListener, times(1)).onChanged();
 
-        mSubscriptionChangeReceiver.onReceive(mContext, intentRadioTech);
+        sendIntentToReceiver(INTENT_MULTI_SIM_CONFIG_CHANGED);
+        verify(mListener, times(2)).onChanged();
+
+        mListener.stop();
+
+        sendIntentToReceiver(INTENT_RADIO_TECHNOLOGY_CHANGED);
+        sendIntentToReceiver(INTENT_MULTI_SIM_CONFIG_CHANGED);
+        verify(mListener, times(2)).onChanged();
+    }
+
+    @Test
+    public void start_carrierConfigChangedIntent_onChangedWhenSubIdBeenCached() {
+        sendIntentToReceiver(INTENT_CARRIER_CONFIG_CHANGED);
+        verify(mListener, never()).onChanged();
+
+        mListener.start();
+
+        mListener.getActiveSubscriptionsInfo();
+
+        sendIntentToReceiver(INTENT_CARRIER_CONFIG_CHANGED);
+        verify(mListener, never()).onChanged();
+
+        INTENT_CARRIER_CONFIG_CHANGED.putExtra(CarrierConfigManager.EXTRA_SUBSCRIPTION_INDEX,
+                SUB_ID2);
+        sendIntentToReceiver(INTENT_CARRIER_CONFIG_CHANGED);
         verify(mListener, times(1)).onChanged();
 
         mListener.stop();
 
-        mContext.sendStickyBroadcast(intentSubscription);
-        mContext.sendStickyBroadcast(intentRadioTech);
+        sendIntentToReceiver(INTENT_CARRIER_CONFIG_CHANGED);
         verify(mListener, times(1)).onChanged();
     }
 
+
     @Test
     public void start_alwaysFetchAndCacheResult() {
-        mListener = spy(new ActiveSubsciptionsListener(mContext) {
-            public void onChanged() {}
-        });
-        mActiveSubscriptions.add(mSubscriptionInfo1);
-        mActiveSubscriptions.add(mSubscriptionInfo2);
-
         mListener.start();
 
         List<SubscriptionInfo> subInfoList = null;
@@ -130,8 +176,7 @@
             if (mActiveSubscriptions.size() > numberOfSubInfo) {
                 mActiveSubscriptions.remove(numberOfSubInfo);
             }
-            when(mSubscriptionManager.getActiveSubscriptionInfoList())
-                    .thenReturn(mActiveSubscriptions);
+            mShadowSubscriptionManager.setActiveSubscriptionInfoList(mActiveSubscriptions);
 
             // fetch twice and test if they generated access to SubscriptionManager only once
             subInfoList = mListener.getActiveSubscriptionsInfo();
@@ -143,7 +188,7 @@
             mListener.clearCache();
         }
 
-        when(mSubscriptionManager.getActiveSubscriptionInfoList()).thenReturn(null);
+        mShadowSubscriptionManager.setActiveSubscriptionInfoList(null);
 
         // fetch twice and test if they generated access to SubscriptionManager only once
         subInfoList = mListener.getActiveSubscriptionsInfo();
diff --git a/tests/robotests/src/com/android/settings/network/GlobalSettingsChangeListenerTest.java b/tests/robotests/src/com/android/settings/network/GlobalSettingsChangeListenerTest.java
index 8f41b4a..e419071 100644
--- a/tests/robotests/src/com/android/settings/network/GlobalSettingsChangeListenerTest.java
+++ b/tests/robotests/src/com/android/settings/network/GlobalSettingsChangeListenerTest.java
@@ -22,6 +22,7 @@
 import static org.mockito.Mockito.verify;
 
 import android.content.Context;
+import android.os.Looper;
 import android.provider.Settings;
 
 import androidx.lifecycle.Lifecycle;
@@ -49,7 +50,8 @@
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mContext = spy(RuntimeEnvironment.application);
-        mListener = spy(new GlobalSettingsChangeListener(mContext, SETTINGS_FIELD) {
+        mListener = spy(new GlobalSettingsChangeListener(Looper.getMainLooper(),
+                mContext, SETTINGS_FIELD) {
             public void onChanged(String field) {}
         });