After jailbreaking with PwnageTool here is a tutorial on how to unlock using UltraSn0w. It is now possible to upgrade to the iOS4.1 firmware, while preserving your baseband by using the new Pwnage tool. Below is a tutorial on how to unlock your iPhone running a custom cooked iOS4.1 firmware.

UltraSn0w 1.1-1 supports the following iDevices :

* iPhone 3G
* iPhone 3GS
* iPhone 4

Note: UltraSn0w works only if you have jailbroken you iPhone with the Pwnagetool 4.1.

The Dev-Team have kept their promise and have released the Unlock only a couple of days after the jaiblreak was launched. So,if you are looking forward to unlocking your iPhone, follow the tutorial below.

This new unlock will work on the following basebands:

* iPhone 4G baseband - 01.59.
* iPhone 3G/3GS basebands - 04.26.08, 05.11.07, 05.12.01, 05.13.04.

Requirements:

Activated iPhone 3G/ 3GS /4G

Note: If your iPhone is not activated then this version of unlock will not work.