Originally Posted by mistWalker
I realize that your BB is unlocked, but the fact it is a Cingular device, meaning that it includes some Cingular customization and firmware changes, could that be part of the problem.
This really isn't an issue in my experience. I've used Cingular 7290's and 8700's with both TMO and Cingular (and vice versa) without any problems. The devices are pretty much identical at this point in the game. Sometimes the needed service books don't get pushed out properly but that doesn't have anything to do with the devices themselves.