[Mellor]

Originally Posted by Stainless_Steel

What's to stop a thief disabling this setting???

The passcode lock prevents them from turning off the setting in the short term.

Originally Posted by cococoady

Does this turn off the tracking?

Yes. If the phone is off, then it can't using network data to pinpoint its location.

Originally Posted by antodeco

I originally just had the setting but then I downloaded the app too. As far as I know, it's just the setting that you need.

The setting allows that device to be tracked.
The app is for tracking other devices.