Can't receive text messages

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http://forums.androidcentral.com – I have an international Note 2 (N7100) that I use on AT&T. Sometime within the last day or two the phone stopped receiving text messages, although it still has no problem sending them. I've tried all the easy stuff: restarting, reseating the SIM, using a different messaging app. So far no luck. Any ideas? (HowTos)