Your phone shows your location on the map using a satellite positioning system, Wi-Fi, or network (Cell ID) based positioning.
The availability, accuracy and completeness of the location info depend on, for example, your location, surroundings, and third party sources, and may be limited. Location info may not be available, for example, inside buildings or underground.
The Assisted GPS (A-GPS) network service and other similar enhancements to GPS and GLONASS retrieve location info using the mobile network, and assist in calculating your current location.
Some satellite positioning systems may require transferring small amounts of data over the mobile network. If you want to avoid data costs, for example when traveling, you can switch the mobile data connection off in your phone settings.
Wi-Fi positioning improves positioning accuracy when satellite signals are not available, especially when you are indoors or between tall buildings. If you're in a place where the use of Wi-Fi is restricted, you can switch Wi-Fi off in your phone settings.
Tap Settings > tap Location and switch Location On.