MMS to AT&T not working

[c_rod44305]

So att customers cant view my mms messages that i send but i can see theirs. All other carriers seem to work fine. (I used to have att, ported to tmobile last month and am using an 8900)

Any thoughts?

[Artemis68]

Sometimes there are cross-carrier issues with SMS/MMS, especially with recent ported numbers.

Have you tried calling T-Mobile and having them troubleshoot your phone? I used to have cross-carrier issues with my Sidekick and that always fixed them.