It is now possible to jailbreak iPhone 3GS, install it with iPad baseband 6.15.00 and unlock with ultrasn0w 1.2. There are 3 main steps in this process: 1. Update your iPhone to 4.3.1 via iTunes, assuming you have not accidentally updated to iOS 4.3.1 yet. If you have an older baseband 5.13.04 or below, do not update it directly as you will lose a valuable baseband that can be unlocked with ultrasn0w! 2....