diff --git a/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java b/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
index dc915af2d06..f6db3702f10 100644
--- a/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
+++ b/src/com/android/settings/network/telephony/Enhanced4gBasePreferenceController.java
@@ -128,7 +128,7 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
 
     @Override
     public void onStart() {
-        if (mPhoneStateListener == null) {
+        if (!isModeMatched() || (mPhoneStateListener == null)) {
             return;
         }
         mPhoneStateListener.register(mContext, mSubId);
@@ -237,7 +237,9 @@ public class Enhanced4gBasePreferenceController extends TelephonyTogglePreferenc
 
         public void unregister() {
             mCallState = null;
-            mTelephonyManager.listen(this, PhoneStateListener.LISTEN_NONE);
+            if (mTelephonyManager != null) {
+                mTelephonyManager.listen(this, PhoneStateListener.LISTEN_NONE);
+            }
         }
     }