How to Unlock IPhone 4, 2G, 3G, 3GS with UltraSn0w

( Note: If you updated your IPhone 4 to 4.0.2 you will not be able to unlock or Jailbreak it at this time).

Before we start Your device must be jailbroken meaning it has the Cydia app, if you do not have Cydia Click Here.

Step 1: Open Cydia go to  the Manage tab and select Sources.

Step 2:Press the Edit button at the top right corner then Add and type in this source repo666.ultraSn0w.com then add source and wait for Cydia to install it when the  installation is done tap Return to Cydia button.

Step 3: On the source list select Done at the top right corner and go to the source we just entered repo666.ultraSn0w.com and look for UltraSn0w and Install it after the installation is complete Press the Restart Springboard button.

Step 4:Wait for Springboard to restart and thats it you device should be now  Unlocked.