If you are willing to unlock iPhone 4S, 4 or 3GS running on iOS 5.1, 5.0.1 or 5.0, you can grab this repository source to unlock the phone. It is SAM.
Here is the repository source of SAM:
http://repo.bingner.com
Click here for instruction to unlock iPhone 4S, 4 and 3GS on iOS 5.1, 5.0.1, 5.0
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