Finally folks there is a good news for you all that Ultrasn0w 0.93 is finally been released to unlock all iPhones on the latest 05.13.04 baseband running on IOS 4 or 05.12.08 baseband running on iPhone OS 3.1.3. with this tool Users will be able to unlock their iPhone 3G, 3GS with any basebands which is also been mentioned above from this tutorial. The only difference is the Cydia repo which is repo666.ultrasn0w.com. which is only one difference that you will feel
Here is complete tutorial on jailbreaking iPhone 3G for iOS 4, and jailbreaking iPhone 3GS with iOS 4
NOTE: iPhone 3GS users with new bootrom or iPod touch 3G users should avoid iOS 4 until new jailbreak tools are released. [via]
