The unlock for iPhone 4 new baseband 05.14/02.10 has been delayed by the Chronic Dev Team , until iOS 4.2 release in November next month. So bad news for those who missed this tutorial to Upgrade to iOS 4.1 saving Original Baseband.
Hopefully we will have GreenPoison jailbreak released along with iOS 4.2 release , since LimeRa1n Jailbreak seems to work flawless on new iPhone 4 iOS 4.1 and older versions with proper Unlock for Iphone 4 4.1 .
Update : Unlock for Iphone 3GS 3G has been released on iOS 4.2.1 using UltraSn0w 1.2 Unlock . Iphone 4 can be unlocked on baseband 1.59.00 only . 3GS and 3G users have to upgrade their baseband to iPad baseband 06.15.00 in order unlock . Please read the risks associated with it before proceeding.
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