Unlock iPhone 3.1.3 With Ultrasn0w 0.92
After you have jailbroken your iPhone firmware 3.1.3 3G/3GS with Sn0wbreeze, the next step is to unlock it. Here are the steps to unlock your iPhone 3.1.3 using Ultrasn0w 0.92. Note that T-Mobile users, as always, should disable 3G before proceeding with this unlocking. In case you have iPhone 3.1.3 2G, you can jailbreak and unlock it at one go using redsn0w 0.9.4.
1. First jailbreak your iPhone 3.1.3 3G/3GS using Sn0wbreeze. The custom IPSW file created by Sn0wbreeze has Cydia included in it.
2. After the jailbreaking is done, launch Cydia. Go to ‘Sources’ from the ‘Manage’ tab. Tap ‘Edit’, and then ‘Add’.
3. Add the Ultrasn0w source: http://repo666.ultrasn0w.com by tapping ‘Add Source’.
4. Once the repo has been added as a source, you will now be able to find ‘Ultrasn0w’. Simply search for the term ‘Ultrasn0w’.
5. Install Ultrasn0w 0.92 which will automatically unlock your device.
Restart your device and enjoy your jailbroken and unlocked iPhone 3.1.3.