It’s not the MAC address, it’s the BSSID of the wireless network you are connected to, and those around you. Software typically obtains BSSIDs from your mobile

It’s not the MAC address, it’s the BSSID of the wireless network you are connected to, and those around you. Software typically obtains BSSIDs from your mobile OS’s wi-fi frameworks. The BSSID looks like a MAC address, and in many but not all cases, a given AP’s wireless network BSSID is within a byte or two of its actual wi-if radio MAC. Google and Apple maintain their own massive geolocation databases of BSSIDs, signal strength, and latitude/longitude.