Thanks to the hard work of the iPhone Dev Team, the UltraSn0w unlock for iPhone has been updated to play well with iOS 4.3.3. As mentioned in our previous post about UltraSn0w, this will only work with iPhone 4 baseband 1.59.00, and iPhone 3G/3GS basebands 4.26.08, 5.11.07, 5.12.01, 5.13.04, and 6.15.00.
If your baseband is different from these, then you can't unlock for the time being. If your baseband matches one of those above but you are on an older firmware, use PwnageTool to update while preserving the baseband.
In this tutorial, we will show you how to unlock your iPhone 4.3.3 using UltraSn0w...