Happening to us in Indiana. Using on and off airplane mode, as well. I spent about 45 minutes on phone with AT&T tech yesterday and nothing mentioned about prepaid service issues. All she did was check both numbers and then tested sending mms from one phone to another - after restarting both phones. I had been restarting my phone several times to send mms text so I was sure that wasn't a fix. Just realized later to do the airplane mode. We both have Samsung G4 phones.
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