Activation Lock is a new feature in iOS 7 that allows you to remotely wipe all the data on your iPhone, iPad, or iPod touch in case it gets lost or stolen. It’s such a great idea that 78 percent of iPhone users have it enabled.
After Activation Lock is enabled remotely, your iPhone will display a message for you with details on how to return it to you. This is a great feature.
When you get the device back, all you need to do is enter your Apple ID (and password!), and your iPhone or iPad will reactivate, give you a fully functional iOS device again without letting anyone else use it in the meantime.
But where the hell do you enable this feature?