I sent just emails to my friends with no problem BUT when i m trying to send a pix and it seems forever (its not check, its struggle to send out for a while then red X mark..
This is a wild guess........ do you have Aerize Card Loader 2008 installed on your BB?? If so, remove the application and you will be able to send MMS. Check your settings on your BB to see if MMS is set to always for reception and retrieval. If it is then I would resend your service books and restart your BB with a battery pull. Try that then get back to us...
Also if this a new phone or just recently switched T-Mo advises that you send two picture messages to yourself first to get the picture messaging to register on their network and then should be working from there....give that a shot