Unlock iPhone 4, 3GS iOS 5.1 Using UltraSnow Fixer

STEP 1: Once jailbroken, open Cydia, click on Manage > Sources then add this repo http://repo.iparelhos.com.
STEP 2: Once the repo is added, search for ultrasn0w fixer for  5.1 and install it on your device.
STEP 3: After the installing is completed search for “Ultrasn0w”, version 1.2.5 on Cydia and install it.
STEP 4: Restart your iPhone, insert your SIM card and that’s it.
Let us know it this worked with you or not and enjoy using your unlocked device.
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http://cydiahelp.com/unlock-iphone-4-3g-running-ios-5.1-using-ultrasnow-fixer/