Apple iOS released 4.0.1 was earlier today for iPhone 4, iPhone 3G and iPhone 3GS your baseband wasn't upgraded (modem firmware) which it means now you can unlock your iPhone even on the latest iOS 4.0.1 firmware. Currently there is no unlock and jailbreak tool available for iPhone 4 and iPhone 3Gs (new bootrom) UltraSn0w unlocked tools it's available for iPone 3G, iPhone 3Gs (old bootrom) About only work unlocker these baseband (modem firmware) 04.26.08, 05.11.07, 05.12.01, or 05.13.04.
MuscleNerd release new screenshot for iPhone 4 carrier unlock progress on twitter.MuscleNerd sys the next jailbreak from @comex is like first Spirit..all devices, all bootroms,& latest FW , painless install.The baseband-unlocking code used by the dev-team on the first, second, and third generation iPhones (ultrasn0w) needs to be completely rewritten for the fourth generation model - thanks to a new baseband employed by Apple.