How to unlock iPhone 4 with Ultrasn0w

I have posted in previous post on how to jailbreak iPhone 4 using jailbreakme.com
You will have cydia installed on your iPhone 4 after the jailbreak. Now here is the tutorial on how to use it to unlock your iPhone 4.....


How to Unlock iPhone 4 with UltraSn0w:


T-Mobile USA users please disable 3G network first. Go to Settings ->General ->Network and turn the “Enable 3G” switch to OFF.


Open the Cydia.
Go to manage Tab at bottom.
Hit the big Sources button.


Hit the Edit button on Top-Right
Then Hit the Add button on Top-Left
Then Enter the following URL: http://repo666.ultrasn0w.com and hit the Add Source button.


Once the Source is added to the Cydia, hit the big return to Cydia button at bottom of the screen and then Done button.
Go to Search tab and search for ultrasn0w and install it.


Installing UltraSn0w will unlock iPhone 4 iOS 4.0.1, 4.0 with baseband 01.59.00. Once the installation is completed, reboot your iPhone 4.

You should now have an unlocked iPhone 4 baseband 01.59.00 with UltraSn0w 1.0-1 and can use a SIM card from any carrier now.