I have an iPhone 3GS and I can't get the mms working. I have unlocked my brothers iPhone for tmobile and I downloaded the mobile config file from help.benm.at/help.php and the cellular network data part shows up on his. My iPhone is on AT&T and I did the same thing on mine and the cellular data part doesn't show up. But the internet tethering does. Has anybody got mms workig on an AT&T iPhone?