Tap to launch Cydia from your SpringBoard.
Press to select the Manage tab at the bottom of the screen.
Tap the large Sources button.
Press the Edit button at the top right of the screen.
Press the Add button that appears at the top left of the screen.
Input http://apps.iphoneislam.com then press the Add Source button.
Press the large Return to Cydia button.
Tap the Done button to continue.
Press to select iPhoneIslam from the list of sources.
Press to select FaceIt-3GS from the list of packages
Press the Install button at the top right of the screen.
Press the Confirm button to begin installation.
Tap the large Reboot Device button.
When your iPhone reboots, tap the Settings button on your SpringBoard.
Press to select Phone from the Settings Menu.
Move the FaceTime switch to the ON position.
FaceTime is now enabled and you can begin video calling!
***Congratulations to iPhoneIslam for this excellent hack.