ok guys i got my iphone and ordered GEVEY TURBO SIM from e-bay.. now i want to use t-mobile what i need to do?? do i just have to put GEVEY TURBO SIM behind my t-mobile sim and connect to itunes?? please help me.. and do i need to jailbreak my iphone .. please give guide to jailbreak iphone 3g running firmware 2.1 please help.. me urgent