don't you loose 250 though??? I say buy a used 3gs for 250....without contract.... then begin a new line and buy a new iphone 4gs/5 and sell the 3gs... you break even...that way...
No you would get your money back and have an iphone 4 then 6 months later a iphone 5 for free........
Buy a new phone 4 (White) now on contract for 200 keep it for 6 months then sell it on ebay when the 6 months is up......For 400 to 450 then get a new iphone 5 with the early upgrade for 450.
Its a pretty damn good idea.........