[RyJones]

I built a demo of this back when I worked at Qualcomm in Seattle; match this with WiFi beacons and you can trace a person fairly well. It's been over a decade, but at the time both iOS and Android would send pings fairly frequently to all known WiFi networks looking to see if they should switch to a faster one. With your device ID, list of SSIDs you know, and your TPMS data, a person can learn a lot about you.

Like, where do you work? Where do you stay (Hotel SSIDs)? Who are your friends (other people's home SSIDs)?

[CSSer]

And this is what I exhaustively tell people who insist that [tech company] is listening. My reply boils down to, "Why would they need to when you already send them everything in writing?"

[0x3f]

Phones randomize hardware addresses now, so this doesn't work. Although there are better, not-so-publicly-known, ways to do it anyway.

[hypercube33]

Pretty sure at least every newish GM car broadcasts wifi and probably doesn't MAC address rotate so there's that...