There's a lot of reasons you might want to switch your location on or off on your iPhone. Some geolocation-based apps, like Google Maps or ridesharing services, need location access to function (it's kind of the point). The iPhone camera connects location data with your photos and videos. Some social media apps that allow you to check in to places need to you to turn the location on. But perhaps you don't feel like handing your precise location data over to tech companies, or potentially, other people?