via pdroms:

This is a SIM unlocking tool for the iPhone.

Please note that this version works only on VIRGIN 1.0.2 or 1.1.1 phones. DO NOT USE IF YOU HAVE ALREADY UNLOCKED WITH ANYSIM 1.0! USE AT OWN RISK!!!

Source & Download: http://conceitedsoftware.com/iphone/site/anysim11.html
Optional Download: http://www.pdroms.de/files/656/