Wow, that's odd. Was yours jailbroken? Not sure if that's a must to work on T-Mo or not, but hers was. Might have made a difference. As I recall though, there was some setting that they had to do on their end, and we had to do some APN changes on her phone as well. I know you said that you're switching providers, but I can see if I can go back and figure out what we did if you'd like.