once you jailbreak download Ultrasn0w through cydia on the iphone, you should be able to use any sim then
Is it that easy to software unlock? just download Ultrasnow through cydia, install and thats it job done?
Because i got someone at the market to do my misses as i wasnt confident in doing someone else's phone incase i buggered something up
but if it was THAT easy i wish id read up about it first now