I am planning on getting the iPhone 5 on AT&T, Sprint, or Verizon in the near fortune. With the plan I'm on for T-Mobile, it is cheaper to simply start a new account with a new carrier and continue paying for T-Mobile service. I am wondering if it is possible to move my T-Mobile number to the new carrier , and vise versa (i.e. could I also move the new carrier's number to T-Mobile?). Essentially, I am wondering if it is possible to switch the two phone numbers I would "own" to each other's carrier. Thanks, guys!