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requirements:
-Unit must be Jailbroken Cydia installed
-Wi-Fi connection
Press to launch Cydia Installer from your SpringBoard.
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Press to select the Manage tab at the bottom of the screen.
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Press to select the large Sources button
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If the ultrasn0w repo is not present press the Edit button at the top right of the screen. Otherwise, skip to next step.
How to add ultra snow repo:
-Press the Add button at the top left of the screen.
-Enter http://repo666.ultrasn0w.com/ as the source url and press the Add Source button.
-Once the source has been added press the large Return to Cydia button.
-Press the Done button at the top right of the screen.
Press to select repo666.ultrasn0w.com from the list of user entered sources.
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Press to select ultrasn0w from the list of packages
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Press the Install button at the top right of the screen.
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Press the Confirm button at the top right of the screen.
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After installation completes successfully press the reboot device tab
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Once your unit reboots inserted a different carrier sim
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Big thanks Iphone Dev team