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Step 1: Once you have jailbroken your device using evasi0n untether, download and install the Ultrasn0w 6.1 package. To do so, launch Cydia and click Manage. Then select Source > Edit and choose Add this repo: http://repo666.ultrasn0w.com
Step 2:Â Go to Cydia Search and look for official Ultrasn0w Fixer 6.1 and install it.
Step 3: Go to Search again and find Ultrasn0w v1.2.8. Download and install it by adding the repo (check step 1): http://repo666.ultrasn0w.comÂ
Step 4: Once the Ultrasn0w package is installed, reboot your iPhone.
Step 5: After the device is rebooted, wait for the carrier network signal to show up.
After the carrier network signal appears, your iPhone will be unlocked with Ultrasn0w Fixer for iOS 6.1. Now, you should be able to switch your carrier SIM.
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Source Article from http://www.ibtimes.co.uk/articles/433309/20130209/unlock-iphone4-iphone3g-iphone3gs-ios61-ultrasn0w-fixer.htm