UltraSn0w 1.2.5 Released: Unlock for iPhone 3GS & iPhone 4 supporting iOS 5.0.1
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Ultrasn0w 1.2.5 has just been released on Cydia supporting the latest iOS 5.0.1 firmware. Sadly, it still does not support any new basebands.
What does UltraSn0w do?
Ultrasn0w enables you to unlock your iPhone and allows you to use it with any other GSM carrier. (ie. T-Mobile)
Of course, Unlocking your device first requires you to Jailbreak your device. [How to Jailbreak iOS 5.0.1]
Also, you will still NEED an unlockable baseband to utilize ultrasn0w
iPhone 4: baseband 01.59.00
iPhone 3GS: basebands 04.26.08 05.11.07 05.12.01 05.13.04 and 06.15.00
If you don’t have the listed basebands above..you are out of luck. Hopefully they have another update soon that supports all the latest basebands, but we can only hope for now.