Go read this New York Times exposé on smartphone location tracking because it’s worse than you think - The Verge
[https://www.theverge.com/2019/12/19/21029992/smartphone-location-tracking-legal-technology-privacy-new-york-times] - - public:commodore
Deeply disturbing reporting on smartphone location tracking. iPhone Android alike. Location is supposed to anonymized but it is easily decipherable.