Alright so i found out my new iPhone 3gs was blacklisted/locked etc. I thought about doing an unlock service: http://www.ebay.com/itm/Unlock-Code-Serv...56507e95bb it looks promising and such. But should i just unlock my phone, switch to T-Mobile and use them? They both us GSM so i ASSUME it would work correct? Any advice is greatly needed! Or should i try the Unlock service? i Live in the USA by the way.