Not everyone carries a phone, let alone a smartphone. Not everyone wants to. Geotagging pictures is a very important use case for a professional photographer,

Not everyone carries a phone, let alone a smartphone. Not everyone wants to. Geotagging pictures is a very important use case for a professional photographer, and relying on the user to provide GPS through another device is not advisable. Also phone location services may not work very well without a cell signal, and not everyone takes photos only within range of a cell tower.