iPhone 3S / 3GS / 4 users can unlock their iPhone running iOS 5 using the latest Ultrasn0w 1.2.4. The supported baseband for Ultrans0w unlock are 04.26.08, 05.11.07, 05.12.01, 05.13.04, and 06.15.00 for iPhone 3G and iPhone 3GS, and 01.59.00 for iPhone 4.

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