The iPhone Dev-Team has finally released the long awaited unlock for iPhone baseband 05.12.01 OS 3.1.3 for iPhone 3GS and iPhone 3G in form of UltraSn0w 0.93. Using UltraSn0w 0.93 unlock users can unlock iPhone 05.12.01 baseband. Indeed a great news for all iPhone 3GS and iPhone 3G users with Baseband 05.12.01 running iPhone OS 3.1.3.
Guide to Unlock iOS 4.0 05.13.04 Baseband with UltraSn0w 0.93
Step 1
Open Cydia on jailbroken iPhone 3GS iOS 4
Step 2
Select Manage tab at the bottom of iPhone screen and then select Sources
Step 3
Click Edit button and then click Add button. There enter the following URL: http://repo666.ultrasn0w.com and press the Add Source button
When the Source will be added, press the Return to Cydia button at bottom of the screen and then press Done
Step 4
Now, go to Search tab and type there ultrasn0w and install it
Step 5
It will automatically unlock jailbroken iPhone 3GS, 3G with baseband 04.26.08 to 05.13.04 running over iOS 4.0
Note: T-Mobile users must disable 3G network before proceeding further. Ultrasn0w 0.93 works to unlock firmware iOS 4.0, OS 3.1.3, 3.1.2, 3.1,3.0 for iPhone 3GS and 3G.