On Monday we finally got out hands on the first official jailbreaking solution for the iPhone 4. Ultrasn0w has been released by the dev team and is easy to use to unlock the iPhone 4, 3G and 3GS.
All you have to do is jailbreak your iPhone and then open up Cydia. Make sure you have the repo666.ultrasn0w.com repository added and then look for the “Ultrasn0w” app and install it.
This will then unlock your iPhone 4 baseband 01.59 and 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01 and 05.13.04
So basically you can unlock any iPhone once again
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