FaceTime is automatically activated as part of the overall setup process you go through the first time you turn on a new iPhone, iPod touch, iPad, or Mac. If for some reason it doesn't seem to have been activated, or if you'd rather turn it off, you can also enable or disable FaceTime at any time. If you're worried about children having access to FaceTime, you can even lock it out completely using parental restrictions.
FaceTime will start the activation process and you'll soon be able to make video calls. To disable FaceTime
If you ever want to re-enable FaceTime, you can just pop back into settings and turn it on again.
On the iPhone, FaceTime will no longer be an option in the Phone app, and on iPad or iPod touch, the FaceTime app will no longer be present on the Home screen or available via Spotlight.
To remove the restriction, repeat the above process and toggle the FaceTime slider back to the ON position.
If you need more help with using FaceTime on your iPhone, iPod touch, iPad, or Mac, check out the articles below, or head on over to the iMore forums.