I bought a locked to T-Mobile 8220, and successfully unlocked it to ATT...but as with any other locked phone after unlocking I can't send or receive MMS messages. I spent over an hour on the phone with ATT she tried everything to try to help me and then sent me to an ATT blackberry expert only to have them tell me because it was a locked phone that they couldn't help me. I've tried just about everything with no success! Please help!!