UltraSn0w Unlock has been released to unlock iPhone 3GS iOS 4.0 with 04.26.08 baseband and old BootRom. Indeed a great news for loyal dev-team followers who used PwnageTool to update firmware but preserved their baseband at 04.26.08. Update: UltraSn0w 0.93 is out now! and it can Unlock all Basebands.. Check the Updates at the bottom.