Data is crowdsourced and contributed by users. On a much larger scale, Apple and Google collect data from iOS and Android devices to power their WiFi/mobile tow

Data is crowdsourced and contributed by users. On a much larger scale, Apple and Google collect data from iOS and Android devices to power their WiFi/mobile tower based geolocation services. Android's Location Services: https://support.google.com/android/answer/3467281#location_accuracy https://support.google.com/android/answer/3467281#location_a... iOS's Location Services: https://support.apple.com/en-gb/102515 https://support.apple.com/en-gb/102515 In fact, Google provides it as a paid API: https://developers.google.com/maps/documentation/geolocation/overview https://developers.google.com/maps/documentation/geolocation..., but you require BSSID's and not just SSID names to try to curb abuse.