Ultrasnow 0.93 was released yesterday to unlock iPhone 3G/iPhone 3GS. Before unlocking you must jailbreak your iPhone 3G using rednsow 0.9.5 beta 5. Unlocking iPhone 3G/iPhone 3GS lets you use your iPhone on other carrier than AT&T. T-mobile users must disable their 3G before proceeding to unlocking their iPhone.
UltrasnOw 0.93 iPhone unlocking tool works well on iOS 4.0 with all baseband 05.13.04 to 04.26.08, so if you have preserved your baseband since the upgrade of new iOS 4.0 you can unlock your iPhone 3G/3GS using this unlocking tool.
Steps to unlock iPhone 3G/iPhone 3GS running on iOS 4.0 using UltrasnOw 0.93
#1 Jailbreak your iPhone 3G iOS 4.0 using redsnOw 0.9.5 beta 5.
#2 Start cydia and go to manager
#3 Go to source and then go to edit and add following repo
Repo666.ultrasn0w.com
#4 Search for ultrasnOw 0.93 and install it.
#5 Ultrasnow 0.93 will do the rest of the work.
Reboot your iPhone. When you restart your iPhone you will able to use carrier of your choice on your mobile. Ultrasnow 0.93 will easily unlock your iPhone 3G/3Gs on iOS 4.0
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How do I unlock an 3g Iphone that doesnt have wireless internet?