i want to buy a iphone 3gs on pay as you go. im not interested in a contract as i am already on one with a blackberry. prob is i have still got a year on my contract with t-mobile
i want to buy an iphone cos i fell in love with my ipod touch.
if i buy the 3gs and get it unlocked, will it work with my contract sim card?
the sim has unlimited wifi and messages. will it work???

please help!!!