Unlock iphone 4 yourself

Follow these steps to how to unlock iphone 4 :-

Before you can follow these instructions you must have a jailbroken iPhone and you must be on the 01.59 or 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00, or baseband(modem firmware).

To find your modem firmware (baseband) versions you can follow this tutorial,

1. Launch Cydia App from your SpringBoard.
2. Go Manage tab at the bottom of the screen.
3. Now Select the large Sources button
4. If ultrasn0w repo is not present press then go to Edit button at the top right of the screen
5. Now press Add button at the top left of the screen.
6. Enter http://repo666.ultrasn0w.com/ as the source url and press the Add Source button.
7. After source added now click the large Return to Cydia button and click Done button.
8. Go to the repo666.ultrasn0w.com and select.
9. Now select ultrasn0w from the list of packages.
10. Click to Install.
11. Click Confirm button at the top right of the screen.
12. After installation completes, click on the large Restart Springboard button.
13. Now you should be able to insert any SIM of your choice!