UPDATE #6: This is the official iOS 4 jailbreak compatibility list. Thanks to this method I now have a jailbroken iPhone 3GS running iOS 4 and some must-have tweaks like SBSettings and Activator. If ...

Just as promised last week, the Dev Team released a few minutes ago a new version of carrier unlocking tool ultrasn0w that now works with iOS 4.2.1. The updated tool, however, won’t work with the ...