diff --git a/src/com/android/phone/CallWaitingSwitchPreference.java b/src/com/android/phone/CallWaitingSwitchPreference.java
index 01dd3b2..1f92845 100644
--- a/src/com/android/phone/CallWaitingSwitchPreference.java
+++ b/src/com/android/phone/CallWaitingSwitchPreference.java
@@ -1,6 +1,7 @@
 package com.android.phone;
 
 import static com.android.phone.TimeConsumingPreferenceActivity.EXCEPTION_ERROR;
+import static com.android.phone.TimeConsumingPreferenceActivity.FDN_CHECK_FAILURE;
 import static com.android.phone.TimeConsumingPreferenceActivity.RESPONSE_ERROR;
 
 import android.content.Context;
@@ -101,17 +102,27 @@
                 }
             }
 
-            if (mIsDuringUpdateProcess && (
-                    mUpdateStatus == TelephonyManager.CALL_WAITING_STATUS_NOT_SUPPORTED
-                            || mUpdateStatus
-                            == TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR)) {
-                Log.d(LOG_TAG, "handleSetCallWaitingResponse: Exception");
-                if (mTcpListener != null) {
-                    mTcpListener.onError(CallWaitingSwitchPreference.this, EXCEPTION_ERROR);
+            if (mQueryStatus != TelephonyManager.CALL_WAITING_STATUS_ENABLED
+                    && mQueryStatus != TelephonyManager.CALL_WAITING_STATUS_DISABLED
+                    && mQueryStatus != TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR) {
+                Log.d(LOG_TAG, "handleGetCallWaitingResponse: Exception:" + mQueryStatus);
+                int error = EXCEPTION_ERROR;
+                switch (mQueryStatus) {
+                    case TelephonyManager.CALL_WAITING_STATUS_FDN_CHECK_FAILURE:
+                        error = FDN_CHECK_FAILURE;
+                        break;
+                    default:
+                        error = EXCEPTION_ERROR;
+                        break;
                 }
-            } else if (mQueryStatus == TelephonyManager.CALL_WAITING_STATUS_NOT_SUPPORTED
-                    || mQueryStatus == TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR) {
-                Log.d(LOG_TAG, "handleGetCallWaitingResponse: Exception");
+                if (mTcpListener != null) {
+                    mTcpListener.onError(CallWaitingSwitchPreference.this, error);
+                }
+            } else if (mQueryStatus == TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR
+                    || (mIsDuringUpdateProcess && (
+                    mUpdateStatus != TelephonyManager.CALL_WAITING_STATUS_ENABLED
+                            && mUpdateStatus != TelephonyManager.CALL_WAITING_STATUS_DISABLED))) {
+                Log.d(LOG_TAG, "handleSetCallWaitingResponse: Exception");
                 if (mTcpListener != null) {
                     mTcpListener.onError(CallWaitingSwitchPreference.this, RESPONSE_ERROR);
                 }
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 77bcd0c..c988cbf 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -1259,7 +1259,7 @@
                     ar = (AsyncResult) msg.obj;
                     request = (MainThreadRequest) ar.userObj;
                     Consumer<Integer> callback = (Consumer<Integer>) request.argument;
-                    int callForwardingStatus = TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR;
+                    int callWaitingStatus = TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR;
                     if (ar.exception == null && ar.result != null) {
                         int[] callForwardResults = (int[]) ar.result;
                         // Service Class is a bit mask per 3gpp 27.007.
@@ -1267,11 +1267,11 @@
                         if (callForwardResults.length > 1
                                 && ((callForwardResults[1]
                                 & CommandsInterface.SERVICE_CLASS_VOICE) > 0)) {
-                            callForwardingStatus = callForwardResults[0] == 0
+                            callWaitingStatus = callForwardResults[0] == 0
                                     ? TelephonyManager.CALL_WAITING_STATUS_DISABLED
                                     : TelephonyManager.CALL_WAITING_STATUS_ENABLED;
                         } else {
-                            callForwardingStatus = TelephonyManager.CALL_WAITING_STATUS_DISABLED;
+                            callWaitingStatus = TelephonyManager.CALL_WAITING_STATUS_DISABLED;
                         }
                     } else {
                         if (ar.result == null) {
@@ -1284,12 +1284,15 @@
                             CommandException.Error error =
                                     ((CommandException) (ar.exception)).getCommandError();
                             if (error == CommandException.Error.REQUEST_NOT_SUPPORTED) {
-                                callForwardingStatus =
+                                callWaitingStatus =
                                         TelephonyManager.CALL_WAITING_STATUS_NOT_SUPPORTED;
+                            } else if (error == CommandException.Error.FDN_CHECK_FAILURE) {
+                                callWaitingStatus =
+                                        TelephonyManager.CALL_WAITING_STATUS_FDN_CHECK_FAILURE;
                             }
                         }
                     }
-                    callback.accept(callForwardingStatus);
+                    callback.accept(callWaitingStatus);
                     break;
                 }
 
@@ -1314,6 +1317,9 @@
                                     ((CommandException) (ar.exception)).getCommandError();
                             if (error == CommandException.Error.REQUEST_NOT_SUPPORTED) {
                                 callback.accept(TelephonyManager.CALL_WAITING_STATUS_NOT_SUPPORTED);
+                            } else if (error == CommandException.Error.FDN_CHECK_FAILURE) {
+                                callback.accept(
+                                        TelephonyManager.CALL_WAITING_STATUS_FDN_CHECK_FAILURE);
                             } else {
                                 callback.accept(TelephonyManager.CALL_WAITING_STATUS_UNKNOWN_ERROR);
                             }