procedure
1.baseband must be 04.26.08 thru 05.13.04
2.jailbroken
3.afc2add must present to avoid error or just jailbreak using redsn0w ( latest release is
in beta ver. it may affect the unlock process) so use at your own risk..
4.download my software here
http://www.mediafire.com/?0gnojzjmze55.tick unlock
6.reboot twice ( 2times) ..done!
much better if you apply 3.1.3 fw version and redsnow 0.9.4 jailbreak
coz ios4.0 fw and redsn0w 0.9.5b5-3 are both buggy as of now..
100% tested and ok..
credits to dev-team
thanks