When I go in to my local Apple Store to pick up 2 new 3gs (one for me one for my wife, both to be on the same plan), will I be able/allowed to select new phone numbers? (i.e. I do not want to keep my current T-Mobile numbers. I want to choose the number myself from available options and not be assigned some random number.) At the very least, I want to be able to pick my own prefix. I would pay a few to do this. Anyone tried this?