FaceIt 3GS is a new Tweak that enables FaceTime video call on iPhone 3GS (Jailbroken). You can download Faceit 3GS from Cydia to enable FaceTime on iPhone 3GS via iPhoneIslam repository. Officially, FaceTime is an iPhone 4/iPod Touch 4G-only feature.
How To Enable FaceTime On IPhone 3GS
We assume that your iPhone 3GS is jailbroken and running iOS 4.1
Open Cydia
Add the following repo: http://apps.iphoneislam.com
Go to search tab, and search for Faceit-3GS
Install Faceit-3GS and reboot your iPhone 3GS
After reboot, go to: Settings > Phone and turn FaceTime ON.
via Limera1n