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Now that you have successfully Jailbroken your iPhone, you may be able to unlock your iPhone to access different phone carriers. This depends on the “Modem Firmware” version (also called “Baseband” version) of your iPhone. Need help finding your version? The following Modem Firmware versions are currently able to be unlocked: 06.15.00, 05.13.04, 05.12.01, 05.11.07, or 04.26.08.
Basebands 2.10.04 and 3.10.01 can not currently be unlocked, jailbreak only.

Important: If you are a T-Mobile user, turn off the 3G feature before unlocking your iPhone.

Step 1: Launch Cydia

Tap the Cydia icon present on your iPhone SpringBoard to launch the Cydia application.

Step 2: Manage Cydia

A Cydia application screen will appear. On the bottom of the application area, you will find a Manage icon. Tap on the Manage icon to proceed further.

Step 3: Sources

On the Manage screen, tap on Sources.

Step 4: Edit

Then tap the “Edit” button located on the top right corner.

Step 5: Add

Now, tap on the “Add” button located on the top left corner to add a new source.

Step 6: Enter URL

Enter this as the url http://repo666.ultrasnOw.com and tap “Add Source” button to continue.

Step 7: Return To Cydia

Once the source has been verified and added tap the “Return to Cydia” button.

Step 8: Sources Done

Now, tap “Done” button located on the top right corner and select the url that you just added.

Step 9: Select Source

Press to select repo666.ultrasn0w.com from the list of user entered sources.

Step 10: Select ultrasnow

Press to select ultrasn0w from the list of packages.

Step 11: Install

Select the application and tap “Install” button located on the top right corner.

Step 12: Confirm

Tap “Confirm” button to confirm the installation of the application.

Step 13: Restart SpringBoard

After installation completes successfully press the large Restart Springboard button.

Your iPhone will restart, once the installation is complete.

Step 13: Unlock Complete

Congratulations. Your iPhone is now unlocked. You can now use any SIM card with your iPhone.