Heres a simple step-by-step tutorial on how to unlock the iPhone 4 using UltraSn0w ( iOS 4.0 / 4.0.1). To begin, make sure your device is jailbroken. You can jailbreak using http://www.jailbreakme.com. This is a really simple jailbreak process, just go to this website and slide to jailbreak. Wait for your device to jailbreak, this might take a few minute depending on how fast your wifi or 3g network is. Next, if you’re unlocking to T-Mobile USA, go to Settings then general then network then disable 3g.

After that, go into Cydia and type in “ultrasn0w.” Make sure Ultrasn0w is version 1.0-1 or higher. If it is not, add the repo repo666.ultrasn0w.com. Then, click install, then confirm, and your device will now be unlocked.

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