Thanks for the insight! I guess I've been to involved in location stuff for a while. You'll get a feel of the location system with Google Maps quite easily: Yo

Thanks for the insight! I guess I've been to involved in location stuff for a while. You'll get a feel of the location system with Google Maps quite easily: You get a big light blue circle around "own location" when location comes from mobile network cellid, and a smaller one when it uses WLAN-based location. That signifies the accuracy. And it does indeed find this location even when GPS is off. And this works even when "Mobile network"-setting is off, i.e. the phone is not sending or receiving any data, if you are still connected to a previously known mobile cell. Anecdotally: I moved a few months ago, and didn't change my WLAN network id. At my new place, when GPS was not available, Google Maps was showing my location to my old place. This continued until I renamed the WLAN and used Google Maps with GPS near my new place. This shows the weakness of crowdsourced location data, but such incidents are rare enough that it basically "just works".