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More Confirms from MuscleNerd, one of the iPhone Dev Team which tweeted that Ultrasn0w 0.93 Works for all basebands since 3.0 FW and I already posted the guide to Unlock your iPhone 3GS and 3G using Ultrasn0w 0.93..

It's recommended to Disable 3G if using T-Mobile USA as MuscleNerd tweeted
ultrasn0w tips: 1) Works for all basebands since 3.0 FW http://is.gd/cY0uv 2) Remember to disable 3G on T-Mobile USA​
Step by Step guide to Unlock iPhone on any Baseband Including (04.26.08, 05.11.07, 05.12.01 and 5.13.04) already posted at the Link below:
 
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