On most phones, coordinates are not saved just because the device GPS is on. Two things are usually required: the phone location service must be enabled and the camera app must have permission to access it.
1. Turn on the phone location service
Open the phone settings and make sure location, positioning, or location services are enabled before taking photos.
2. Give the camera app location permission
Check in settings that the camera app can access location. If the permission is denied, the photos will not store coordinates even if the phone GPS is active.
3. Confirm that location tags are enabled
Some phones include an extra option inside the camera or gallery itself, with names such as location, location tags, or save location. It is worth checking it once and leaving it enabled.
4. Run a quick test before using it on site
Take a test photo, open it in the gallery, and check whether location information or a related map appears. That quick verification avoids discovering the issue after many photos have already been taken.
The exact menu names vary by brand and operating system, but the logic is usually the same on all phones: global location enabled, camera permission granted, and a real-photo check.