MMS won't send/recieve on unlocked storm with T-Mobile

[orolando]

I have a fully unlocked Storm 9530. I followed pltaylor's guide to achieving full functionality and now have an "sms and mms" icon where it was previously only sms. Problem is...whenever I form an mms message and press send (attaches picture and preps the mms message perfectly), the little red clock just sits next to the message. It never sends. I tried sending one to myself after requesting a host routing table and the same thing happened. Any ideas out there? Thanks!