Now that it’s easy as pie to jailbreak an iPhone 4, you might be looking for other ways to free your mobile phone from Apple and AT&T’s grip — like unlocking the phone so that it can work on other mobile networks.
Now there’s an app in the Cydia store for jailbroken iPhones. It’s called ultrasn0w 1.0-1, and it can unlock the iPhone 4 and iPhone 3G and 3GS so that you can use the phone on networks that aren’t AT&T.
You can check out video after the break for instructions on jailbreaking your device and installing ultrasn0w to unlock your device.
Bear in mind, jailbreaking and unlocking your phone will probably void your warranty. But if you were planning on using your iPhone on T-Mobile or another network, you probably weren’t expecting your warranty to be valid anyway, were you?