I've had my Galaxy S3 since day one and today it stopped receiving any text messages. I can still send messages, use data, and receive MMS, but I can't receive SMS. I called AT&T and rebooted my phone/pulled the battery and sim to no avail. The AT&T rep said everything looked fine from their end but that they would open a case. I have yet to do a factory reset. I am using the stock messaging app and am not rooted. Any help would be much appreciated.