Note: This is again to Inform you that this Unlock is not for New Basebands, It is for Already Unlockable Basebands such as 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00.
Also make sure your device is successfully Jailbroken, If you haven't yet jailbroken your device on iOS 5 you can follow our guide here.
Guide: How to Unlock iPhone 4, iPhone 3GS running iOS 5 with Ultrasn0w 1.2.4, older baseband:
Step 1: First of all Go to "Cydia" then "Manage Tab"
Step 2: Now Go to "Sources" then Click "Edit" and click "Add"
Step 3: Now Write,
And then click "Add Source"
Step 5: Click Install, And then Restart your iPhone.
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