Making a Point to Point Call Using FaceTime to Another iPhone 4
Click the contact icon (usually on the front page of your iPhone screen.)
Select (search for) the contact.
The contact name will appear–look for the “FaceTime” button (it has the letters “FaceTime” with a video camera.
Click on this and you will be connected to another FaceTime contact.
NOTE: It will not connect you to a videophone–only to another iPhone 4 (not iPhone 3 or 3GS.)
NOTE: FaceTime only works in a Wifi environment. It will not work in a cellular (3G) environment.