Same exact issue and I for one know I've never had any issue ever sending mms on att device on tmobile network ...
None of us are apn dummies lol...
THIS MINI ON 4.4.2 JUST DOES NOT SEND OR RECIEVE MMS
We need help guys
This has to be a issue known to some and I'd bet there's a Fix floating around .
Think about it if you set your apn on any unlocked phone once you get your Data icon ... we have always gotten mms to work there after .
Any help guys ?
Sent from my HTC One mini using XDA Free mobile app