The method uses Sam Bingner's SAM (Subscriber Artificial Module) package that can be installed on jailbroken phones.
It has been confirmed working by iPhone Dev-Team member MuscleNerd who notes an update may be coming to SAM from @sbingner to make the procedure simpler.
Loktar_Sun's method will work to unlock your iPhone 4S, iPhone 4, iPhone 3GS, or iPhone 3G. We've posted detailed step by step instructions on how to unlock your device here.
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**Please contribute a translation to the tutorial if you can!!**