Depends on the platform. Ultimately all you need is a list of the routers around you; SSID is often sufficient, but mac adddress is optimal since it can be sent

Depends on the platform. Ultimately all you need is a list of the routers around you; SSID is often sufficient, but mac adddress is optimal since it can be sent to Google API [0] or similar for geolocation. I'm not sure about Android permissions. With iOS, it used to be (like 2 years ago) that any app could get the list of nearby access points, without permission. But AFAIK that was recently changed to be behind a prompt. Not sure if it's the same permission as location services or a different one. [0] https://developers.google.com/maps/documentation/geolocation/intro https://developers.google.com/maps/documentation/geolocation...