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The iPhone Dev-Team has just updated the ultrasn0w unlocking tool for iPhone 4, 3GS and 3G. This new version has lots of new tweaks added for performance and stability improvement. It will also help with standby battery life incase if your phone is draining the battery too fast. The compatibility though remains the same. It will work with all iPhones up to iOS 4.0.1 with baseband 04.26.08, 05.11.07, 05.12.01 and 05.13.04.

ultrasn0w upgraded to version 1.1-1 we’ve tweaked a few things that may help with standby battery life, you can upgrade via Cydia.

Ultrasn0w 1.1-1

You can follow the step by step guide posted here to unlock your iPhone with ultrasn0w so that you can use it with any carrier you like.

Some useful JailbreakMe related fixes that you maybe interested in..

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