I'm on T-Mobile and I had trouble sending MMS. T-Mobile had me change APN settings 3 times with no luck. Well, it would work for the first few hours but then it would go back to not sending. They had me call Axon and we did a cache wipe and other things here and there and nothing, same issue. Finally they recommended a factory reset, which I did, three times! Same problem, so I sent it back.