Dev-Team did it again…The latest update of ultrasn0w supports now unlocking for iPhone 4. Just a couple of days after releasing their easy jailbreak method, Dev-Team releases a new version of ultrasn0w that unlocks the latest and greatest iPhone 4. Ultrasn0w version 1.0.1 is available on Cydia and unlocks iPhone 4 baseband 01.59.00 and iPhone 3 / iPhone 3GS basebands 04.26.04, 05.11.07, 05.12.01 & 05.13.04.
You should of course have an already jailbroken iPhone 4. If you didn’t jailbreak your iPhone yet, there is a short tutorial here. Ultrasn0w should be available on Cydia, but if you cannot find it, you might need to add the following repository: repo666.ultrasn0w.com