I am having problems with my unlocked AT&T 8300. I have Tmobile and it seems that the 8300 is not supported. I have SMS and MMS on my plan, I don’t have email plan. I cant receive or send MMS, so I called tmobile and they don’t know what to do because they don’t support the 8300, I called RIM and they ask me for a code which I don’t have, I browsed in several forums and bb webpage and someone said that I had to delete the service books and load the new service books. Can I load the new version of service books using desktop manager and mini-USB or it has to be done by email or MMS(I don’t have email and MMS doesn’t work). Where can I get the new service books for the 8300 that will be supported by tmobile. Any help, I don’t have much experience with BB and the terminology so please be patient.

Thanks.