I'm thinking of getting the iPhone, but I still have contract time at T-mobile. I understand that buy-out of the contract is 200$. My question is, what happens when I put my iPhone to sync with iTunes and I join with cingular and switch my Tmobile number into a cingular number. Does Tmobile automatically bill me for 200$? Does Tmobile assign that account a different phone number? When I call my number will both my tmobile phone AND my cingular iPhone ring at the same time? Thank you.