Merge "Correct VM number updation during MBDN refresh."

telephony/java/com/android/internal/telephony/gsm/SIMRecords.java

@@ -560,6 +560,13 @@ public final class SIMRecords extends IccRecords {
                 break;
             case EVENT_GET_CPHS_MAILBOX_DONE:
             case EVENT_GET_MBDN_DONE:
+                //Resetting the voice mail number and voice mail tag to null
+                //as these should be updated from the data read from EF_MBDN.
+                //If they are not reset, incase of invalid data/exception these
+                //variables are retaining their previous values and are
+                //causing invalid voice mailbox info display to user.
+                voiceMailNum = null;
+                voiceMailTag = null;
                 isRecordLoadResponse = true;
 
                 ar = (AsyncResult)msg.obj;