Originally Posted by somfCimm
Will the 8320 application software work on the 8310 with Tmo?
No but you don't need the 8320 or any TMO OS on your BB. The service books are what set up your BB for your carrier and they will be pushed automatically to the BB.
Make sure your at&t BIS account was deleted. They don't do this automatically when you close your wireless account. You won't be able to use the TMO BIS until this is done.