I have the same question as the person who started this thread: is it possible to have T-Mobile's t-zones product running simultaneously with the BlackBerry messaging software on the 7100t?
The reason I'm asking is because I want to purchase a second, non-BlackBerry phone from T-Mobile (probably a RAZR or a Samsung T809) and switch my SIM card back and forth between it and my BlackBerry (yeah, I know ...). If I could get t-zones on my plan, I could do this and not lose my ability to get email.
The customer service rep at T-Mobile said I can indeed do this, but when I went to their web site to try to sign up, I wasn't allowed to do that because of the existence of the BlackBerry messaging package on my account. But before I go back to T-Mobile and try to resolve this with them, I decided to come here to ask if anyone else has been able to get t-zones working on their BlackBerry, and if so, to see how well it works for them.