Unlock Required :
iPhone 4, 3GS on iOS 5.1.1 [ Preserved Baseband]
Jailbroken iDevice on any iOS 4.x, iOS 5.x.
Ultrasn0w Fixer 5.1.1.
Compatible Basebands With UltraSnow to Unlock iPhone 4, 3GS UltraSn0w Fixer 5.1.1 :
01.59.00
04.26.08
05.11.07
05.13.01
05.12.01
06.15.00
How To Unlock iPhone 4, 3GS UltraSn0w Fixer 5.1.1 :
Step 1: First thing is to Jailbreak your iPhone from this links on iOS 5.1.1 firmware
Step 2: Now your iPhone is running iOS 5.1.1 firmware, then launch “Cydia” from your iPhone and Add the repo below by go to “Cydia” –> “Manage” –> “Source” –> “Edite” –> “Add”
http://repo.iparelhos.com
Step 3: Open the added repo and search for UltraSn0w Fixer for 5.1.1 and install it.
Step 4: When UltraSn0w Fixer has been installed simply go into “Cydia’s” “Search tab” and search for “UltraSn0w” then install it to your iPhone and reboot.
Step 5: Now You have unlocked your iPhone 4 or iPhone 3GS on iOS 5.1.1 firmware with UltraSn0w Fixer 5.1.1