BlacksnOw
Use Blacksn0w To Unlock iPhone 3.1.3 3G 3GS
Previously I posted about Unlock iPhone 3.1.3 For 3G 3GS Using Ultrasn0w, but if your baseband is 05.11.07 better use Blacksn0w from Geohotz to unlock iPhone 3.1.3 firmware for iPhone 3G and 3GS for old bootrom