When the iPhone 5 is released I'm going to likely be switching to a new provider; either Sprint or Verizon depending on who offers the better deal. This will only be my second iPhone, so I ask those who have more experience: Has it been possible to preorder a new iPhone from a different provider than the one you are currently on, and have them port the number over at the same time? Or is it more convoluted? Say I move to Sprint. Can I just preorder the Sprint iPhone and put in my number to be ported?