diff --git a/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceController.java b/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceController.java
index 94b1761..79cdc2e 100644
--- a/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceController.java
+++ b/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceController.java
@@ -16,7 +16,13 @@
 
 package com.android.settings.network.telephony;
 
+import static androidx.lifecycle.Lifecycle.Event.ON_START;
+import static androidx.lifecycle.Lifecycle.Event.ON_STOP;
+
 import android.content.Context;
+import android.database.ContentObserver;
+import android.os.Handler;
+import android.os.Looper;
 import android.os.PersistableBundle;
 import android.provider.Settings;
 import android.telephony.CarrierConfigManager;
@@ -25,8 +31,12 @@
 import android.telephony.TelephonyManager;
 
 import androidx.annotation.VisibleForTesting;
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
 
 import com.android.internal.telephony.Phone;
 import com.android.internal.telephony.PhoneConstants;
@@ -37,17 +47,27 @@
  */
 public class EnabledNetworkModePreferenceController extends
         TelephonyBasePreferenceController implements
-        ListPreference.OnPreferenceChangeListener {
+        ListPreference.OnPreferenceChangeListener, LifecycleObserver {
 
     private CarrierConfigManager mCarrierConfigManager;
+    private ContentObserver mPreferredNetworkModeObserver;
     private TelephonyManager mTelephonyManager;
     private boolean mIsGlobalCdma;
     @VisibleForTesting
     boolean mShow4GForLTE;
+    private Preference mPreference;
 
     public EnabledNetworkModePreferenceController(Context context, String key) {
         super(context, key);
         mCarrierConfigManager = context.getSystemService(CarrierConfigManager.class);
+        mPreferredNetworkModeObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
+            @Override
+            public void onChange(boolean selfChange) {
+                if (mPreference != null) {
+                    updateState(mPreference);
+                }
+            }
+        };
     }
 
     @Override
@@ -78,6 +98,24 @@
         return visible ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
     }
 
+    @OnLifecycleEvent(ON_START)
+    public void onStart() {
+        mContext.getContentResolver().registerContentObserver(
+                Settings.Global.getUriFor(Settings.Global.PREFERRED_NETWORK_MODE + mSubId), true,
+                mPreferredNetworkModeObserver);
+    }
+
+    @OnLifecycleEvent(ON_STOP)
+    public void onStop() {
+        mContext.getContentResolver().unregisterContentObserver(mPreferredNetworkModeObserver);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
     @Override
     public void updateState(Preference preference) {
         super.updateState(preference);
@@ -102,7 +140,7 @@
         return false;
     }
 
-    public void init(int subId) {
+    public void init(Lifecycle lifecycle, int subId) {
         mSubId = subId;
         final PersistableBundle carrierConfig = mCarrierConfigManager.getConfigForSubId(mSubId);
         mTelephonyManager = TelephonyManager.from(mContext).createForSubscriptionId(mSubId);
@@ -115,6 +153,7 @@
                 ? carrierConfig.getBoolean(
                 CarrierConfigManager.KEY_SHOW_4G_FOR_LTE_DATA_ICON_BOOL)
                 : false;
+        lifecycle.addObserver(this);
     }
 
     private int getPreferredNetworkMode() {
diff --git a/src/com/android/settings/network/telephony/MobileNetworkSettings.java b/src/com/android/settings/network/telephony/MobileNetworkSettings.java
index c8e2247..8d83ef2 100644
--- a/src/com/android/settings/network/telephony/MobileNetworkSettings.java
+++ b/src/com/android/settings/network/telephony/MobileNetworkSettings.java
@@ -150,7 +150,7 @@
         use(CarrierPreferenceController.class).init(mSubId);
         use(DataUsagePreferenceController.class).init(mSubId);
         use(PreferredNetworkModePreferenceController.class).init(mSubId);
-        use(EnabledNetworkModePreferenceController.class).init(mSubId);
+        use(EnabledNetworkModePreferenceController.class).init(getLifecycle(), mSubId);
         use(DataServiceSetupPreferenceController.class).init(mSubId);
         if (!FeatureFlagPersistent.isEnabled(getContext(), FeatureFlags.NETWORK_INTERNET_V2)) {
             use(EuiccPreferenceController.class).init(mSubId);
diff --git a/tests/robotests/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceControllerTest.java b/tests/robotests/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceControllerTest.java
index ba8be90..6a12afd 100644
--- a/tests/robotests/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceControllerTest.java
+++ b/tests/robotests/src/com/android/settings/network/telephony/EnabledNetworkModePreferenceControllerTest.java
@@ -16,6 +16,8 @@
 
 package com.android.settings.network.telephony;
 
+import static androidx.lifecycle.Lifecycle.Event.ON_START;
+
 import static com.android.settings.core.BasePreferenceController.AVAILABLE;
 import static com.android.settings.core.BasePreferenceController.CONDITIONALLY_UNAVAILABLE;
 
@@ -23,19 +25,25 @@
 
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 
 import android.content.Context;
+import android.net.Uri;
 import android.os.PersistableBundle;
 import android.provider.Settings;
 import android.telephony.CarrierConfigManager;
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
 
+import androidx.lifecycle.LifecycleOwner;
 import androidx.preference.ListPreference;
+import androidx.preference.PreferenceScreen;
 
 import com.android.settings.R;
+import com.android.settingslib.core.lifecycle.Lifecycle;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -48,6 +56,7 @@
 @RunWith(RobolectricTestRunner.class)
 public class EnabledNetworkModePreferenceControllerTest {
     private static final int SUB_ID = 2;
+    public static final String KEY = "enabled_network";
 
     @Mock
     private TelephonyManager mTelephonyManager;
@@ -60,11 +69,14 @@
     private EnabledNetworkModePreferenceController mController;
     private ListPreference mPreference;
     private Context mContext;
+    private LifecycleOwner mLifecycleOwner;
+    private Lifecycle mLifecycle;
 
     @Before
     public void setUp() throws Exception {
         MockitoAnnotations.initMocks(this);
-
+        mLifecycleOwner = () -> mLifecycle;
+        mLifecycle = new Lifecycle(mLifecycleOwner);
         mContext = spy(RuntimeEnvironment.application);
         doReturn(mTelephonyManager).when(mContext).getSystemService(Context.TELEPHONY_SERVICE);
         doReturn(mTelephonyManager).when(mContext).getSystemService(TelephonyManager.class);
@@ -79,8 +91,8 @@
         mPreference = new ListPreference(mContext);
         mPreference.setEntries(R.array.enabled_networks_choices);
         mPreference.setEntryValues(R.array.enabled_networks_values);
-        mController = new EnabledNetworkModePreferenceController(mContext, "enabled_network");
-        mController.init(SUB_ID);
+        mController = new EnabledNetworkModePreferenceController(mContext, KEY);
+        mController.init(mLifecycle, SUB_ID);
         mPreference.setKey(mController.getPreferenceKey());
     }
 
@@ -106,7 +118,7 @@
         mPersistableBundle.putBoolean(CarrierConfigManager.KEY_SHOW_4G_FOR_LTE_DATA_ICON_BOOL,
                 true);
 
-        mController.init(SUB_ID);
+        mController.init(mLifecycle, SUB_ID);
 
         assertThat(mController.mShow4GForLTE).isTrue();
     }
@@ -161,4 +173,31 @@
                 Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID, 0)).isNotEqualTo(
                 TelephonyManager.NETWORK_MODE_LTE_GSM_WCDMA);
     }
+
+    @Test
+    public void preferredNetworkModeNotification_preferenceUpdates() {
+        PreferenceScreen screen = mock(PreferenceScreen.class);
+        doReturn(mPreference).when(screen).findPreference(KEY);
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID,
+                TelephonyManager.NETWORK_MODE_TDSCDMA_GSM_WCDMA);
+        mController.displayPreference(screen);
+        mController.updateState(mPreference);
+        mLifecycle.handleLifecycleEvent(ON_START);
+
+        assertThat(Integer.parseInt(mPreference.getValue())).isEqualTo(
+                TelephonyManager.NETWORK_MODE_TDSCDMA_GSM_WCDMA);
+        assertThat(mPreference.getSummary()).isEqualTo("3G");
+
+
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID,
+                TelephonyManager.NETWORK_MODE_GSM_ONLY);
+        final Uri uri = Settings.Global.getUriFor(Settings.Global.PREFERRED_NETWORK_MODE + SUB_ID);
+        mContext.getContentResolver().notifyChange(uri, null);
+
+        assertThat(Integer.parseInt(mPreference.getValue())).isEqualTo(
+                TelephonyManager.NETWORK_MODE_GSM_ONLY);
+        assertThat(mPreference.getSummary()).isEqualTo("2G");
+    }
 }