Finally Dev Team Release the new Pwnage tool 3.1.4 for MAC, which helps you to Jailbreak your iphone with Firmware 3.1.2, read the tutorial here. Now after the Jailbreak so have to unlock your iPhone to use it any of the carriers. So here we are posting the guide which will help you to Unlock your iphone 3.1.2 with ultrasn0w.
Here is the Guide.
1. Jailbreak your iphone with pwnage tool 3.1.4
2. Run Cydia to install Ultrasnow. Select “Manage” tab on the bottom. Than touch on “Sources”.
3. Click edit button and Add following Repo URL
http://repo666.ultrasn0w.com/
and touch on “Add Source”.
4. Now Cydia will automatically update your iPhone Sources.
5. Now search for ultrasn0w in Cydia and install it. This will Automatically Unlock your iPhone.
6. Reboot your iPhone 3G, Thats it.
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