The iPhone Dev team today officially released ultrasn0w which allows you to SIM-unlock any iPhone3G (not 3GS) running iPhone OS 3.0. iClarified has a nice tutorial on the installation which we've shamelessly pasted below.
These are instructions on how to unlock the iPhone 3G for use with any GSM cellphone carrier using UltraSn0w.
Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 04.26.08 baseband(modem firmwa
