I have a factory unlocked iPhone 3GS with iOS 6.1.2. I got the ATT SIM card, everything is set up with calls/text/data, but I still can't figure out how to get MMS. I have tried APN unlocker, unlocker.co.nz, iphone backup bot, iphone configuration utility to create a specific APN, SIM swap with a T-mobile SIM. I'd really appreciate some help getting my MMS to work - without jailbreaking!
См. статью: How to get Straight Talk MMS on unlocked AT&T iPhone? - 1