Before you can make your very first video conference on your iPhone 4g using FaceTime  the setting must be enabled by going to:

Settings.

enable facetime in iphone (settings)

Phone.

enable facetime in iphone (phone)

Slide FaceTime to ON

enable facetime in iphone (FaceTime On)

The activation will take a few seconds and then you’ll be ready to make FaceTime calls to any other Iphone 4.

Note: This feature may be turned on and off while you are in a call.

To start a FaceTime video conference call a contact and tap the FraceTime option.

enable facetime in iphone (FaceTime icon)

Note: This feature will only work on iPhone 4g only.