This can be as “simple” as your phones being in close proximity to each other for an extended period, and sharing device advertising IDs/other device data via WiFi, Bluetooth. Might be more to it, but it’s a likely factor.
Devices do this regularly btw, smartphones also scrape for WiFi networks to better geolocate etc.
This can be as “simple” as your phones being in close proximity to each other for an extended period, and sharing device advertising IDs/other device data via WiFi, Bluetooth. Might be more to it, but it’s a likely factor.
Devices do this regularly btw, smartphones also scrape for WiFi networks to better geolocate etc.