How to Disable Facetime on iPhone 5 (iOS 6)
How to turn off FaceTime calls on your iPhone, iPad or iPod Touch in iOS 6
Updated December 21, 2012
Here's how you can turn off FaceTime calling on your iPhone 5 running iOS 6:
1. Open the Settings app.
2. Scroll down and tap on FaceTime.
3. Toggle the FaceTime switch to the Off position.
4. Facetime will now be turned off, and you will no longer be able to send or receive FaceTime calls on your iPhone 5 (iPad and iPod Touch).
Note: To turn Facetime ON, just toggle the switch back to the On position.