Unlocked issues?

Hi everyone. I'm embarrassed, but in March I left the Blackberry world for a sidekick. It's so shameful! Anyways, I'm coming back to the BB because the sidekick just isn't cutting it. I cannot stand how sloppy the UI is and how often my phone restarts itself. I also hate how all of my contacts must be synced from a server and not saved onto the phone itself. If I purchase an unlocked Blackberry, will I encounter any problems regarding the BIS setup from T-Mobile?

As long as you have a BB data plan with T-Mo I would think not.