Hello, I just got this 3G iphone from Apple as a warranty replacement. To my surprise, it wasn't upgraded to the 2.2.1 firmware yet! I jailbroke it already, and thought I unlocked it at the same time using QuickPwn. However, I get No service with T-Mobile. I want to upgrade to the 2.2 firmware with 2.28 baseband if possible. The phone only works with a Gevey Sim card.