If you haven't already unlocked using SAM, you can follow this unlock tutorial.
Step One
Launch Cydia from your SpringBoard.
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Step Two
Choose Sections from the tabs at the bottom of the screen.
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Step Three
Select System from the list of sections.
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Step Four
Press to select iFile from the list of packages.
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Step Five
Press the Install button at the top right of the screen.
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Step Six
Press Confirm to begin installation.
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Step Seven
Once the installation has completed successfully, press the large Return to Cydia button.
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Step Eight
Press the Home button then launch iFile from your SpringBoard.
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Step Nine
Press the Back button at the top left of your screen to navigate to /var.
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Step Ten
Choose root from the list of folders in /var.
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Step Eleven
Tap to select Library from the list of folders in /var/root.
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Step Twelve
Press the Edit button at the top right of the screen.
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Step Thirteen
Choose Lockdown from the list of folders. Then press the zip icon in the tab bar. It's the second from the left.
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Step Fourteen
Name your archive so you know what SIM card its for. Then press the Create button.
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Step Fifteen
Choose the archive we created from the list of files. Then press the mail icon in the tab bar. It's the third from the right.
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Step Sixteen
Email yourself the archive. Be sure to keep it in a safe place!
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IMPORTANT:
You should perform the unlock procedure and this backup procedure for every SIM you want to use with your iPhone.
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