How to unlock iPhone 3GS and iPhone 3G running iOS 4.2.1 with UltraSnow (Guide)

Here is a step by step guide on how to unlock your jailbreaked iPhone 3G and 3GS. The latest version of  Ultrasnow released by iPhone Dev Team can unlock the latest iOS 4.2.1 and 4.1 firmware on iPhone 3GS and 3G on basebands later then 05.13.04. Due to different baseband iPhone 4 will take a bit more time to be unlocked. To Unlock your iPhone you will have to jailbreak your iPhone. To unlock your iPhone 3GS and iPhone 3G follow these simple steps

Note: In order to unlock your iPhone using ultrasn0w, jailbreak your device using this guide here Link. (This will update your baseband to 06.15.00 and then you can unlock your device using this guide)

  1. Open Cydia From your iPhone
  • Now Hit on Manage Tab
  • Now Select Sources Option

2. Now Tap on Edit Button Add Repo “Repo666.UltraSnow.Com” And now Touch on Add Source button.

3. Now Cydia will update the source automatically. When the update is complete go into the search tab and search “ultrasn0w 1.2″. After Installing that you will be able to use your iPhone with any carrier of your choice.Now reboot your iPhone. You should now have a fully unlocked iPhone 3GS or 3G, running iOS 4.2.1 !