1 What you need to know: If you see a purple arrow next to an app, it’s using your location now. 2  A gray arrow means it’s used your location within the last 24 hours and a purple-outlined arrow means it’s using a geofence (more about geofences later). 3  Pay attention to any apps that have purple or gray arrows next to them. If that arrow is on all the time, there’s probably something wrong. 2  Tap to go back to the main Location Services menu. 3  Turn off Location Services for apps that don’t need to know where you are. 4  What you need to know: If you see a purple arrow next to an app, it’s using your location now.