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 RedSn0w or with PwnageTool. Note that PwnageTool is the preferred method as it helps preserve the baseband.

You can use UltraSn0w to unlock these basebands:

  • 04.26.08
  • 05.11.07
  • 05.12.01
  • 05.13.04

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 or comments on how to unlock iPhone firmware 3.1.3, please leave a comment.

UPDATE: This post is outdated. Check out our unlock section for the latest information about iPhone unlocking.