How can I flash the AT&T software on my phone? Its a T-Mobile phone, and I am trying to use AT&T, but it wont let me change the access points to the AT&T settings (I have the codes).. I have found out that I can flash the AT&T software on the phone somehow, anyone know a specific place that can do this for me? Or a place I can buy the software? Or is there another way to make the phone let me change the access point settings.. any help would be greatly appriciated..

Dave