Hi, I have a week 39 3gs, running version 3.1 and firmware 05.11.07 I am trying to unlock, theoretically with redsn0w and blacksn0w. I have a couple of questions for the experienced. 1. It is possible that this phone has already been unlocked. The previous user claims he was using t-mobile. However, I don't see a blackra1n icon or any application that would lead me to believe that it is. I inserted an active t-mobile sim card, and it did not show a connection. Do I have to reboot the iphone and/or reinstall blacksn0w whenever I insert a new sim? 2. Is redsn0w or blackra1n better for jailbreaking the iphone? Any help is much appreciated.