http://ping.fm/tBT4t
Want to know how to Unlock iPhone 4/3GS on iOS 4.3.1 using Ultrasn0w 1.2.1? As we know iPhone dev team has released Ultrasnow 1.2.1 updated version to fix singal bar issue on iPhone 4 running on iOS 4.3.1 with old baseband. Remember this Ultrasnow update is for those who still preserve unlockable baseband.