All the methods in DataConnectionTracker should be called only through
the handler. Fix this as trySetupData was being called in the broadcast receiver.
Tested: Airplane mode and GPRS retry.
CL 144717: Correctly set user data payload length for non-7-bit encoded payload.
CL 149058: Check for null TP-OA in SmsMessage.parseMessageBody().
CL 138094: Make sure call state (and other updates) have a chance to get processed between data setup attempts.
CL 132624: Added a comment for a way to save a message to the SIM.
