How to Unlock iPhone OS 3.1.3

This guide and tutorial will show you how to unlock iPhone 3.1.3 using UltraSn0w or BlackSn0w, depending on your iPhone baseband.

The first step is to jailbreak your iPhone 3.1.3, either with Sn0wBreeze, RedSn0w or with PwnageTool.

Now we have 2 options for unlocking, and it all depends on your baseband model:

• If your baseband is still at 04.26.08, then you may use UltraSn0w.
• If your baseband is at 05.11.07, you may use BlackSn0w.
• If your baseband is at 05.12.01, you cannot unlock at this time. An exploit has been discovered, so hopefully soon and unlock will be available. Follow us on twitter or our RSS feeds for updates.

To find out what your baseband is, go to Settings -> General -> About -> Modem Firmware.

How to unlock iPhone 3.1.3 with UltraSn0w

• Launch Cydia.
• Add the following source to Cydia repo666.ultrasn0w.com (note there is a “0″ in sn0w, not an “o”).
• After installing this source in Cydia, search for “ultraSn0w”.
• Install UltraSn0w and reboot your iPhone.

How to unlock iPhone 3.1.3 with BlackSn0w

• Launch Cydia.
• Add the following source: http://blackra1n.com.
• After installing this source in Cydia, search for “BlackSn0w”.
• Install BlackSn0w and reboot your iPhone.

Your iPhone should now be unlocked. If you have questions on how to unlock iPhone firmware 3.1.3, please leave a comment.