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Do you have get an error code? Do you have a signal booster where your at and is it a specific area or everywhere you have the issues?
Its pretty much random where it happens, just says try again, and it will keep doing that with both sms and then mms. Just happens out of nowhere. And weirdly enough its while I have plenty of service. I'm never really in areas that don't have any service.
I'll give at&t a call like someone suggested and see what they say.