There is YellowSnow
http://blog.iphone-dev.org/post/6779...eat-yellowsn0w which is VERY specific on which firmware versions and baseband versions it will work on.
If attempting an unlock on a 3G phone, always ensure the compatability of the baseband / firmware with the tool you are using.
Last edited by Fezza; Jan 28, 2009 at 10:10 AM.