What to do:
Run through which apps on your mobile device have permission to know where your phone is. Disable permissions for the ones that don’t absolutely need to know.
Why do it?
Limit the number of apps that have full time access to your location. It not only drains your device battery; it also lets the app developer know where you are all the time. Allow location information while you are using the app, or not at all if the app has no business knowing where you are.
Use built in services such as Find my iPhone or Android Device Manager to find your device, or to remote erase if the phone is stolen or lost.