Unlock iOS 4.3.3 on iPhone 4, 3GS Using Ultrasn0w 1.2.3 [Tutorial]Taimur Asad·May 6, 2011Ultrasn0w 1.2.3 has been released today to make the unlock compatible with iOS 4.3.3 on iPhone 4 and 3GS, running on the old baseband.