Location data for sale... "FCC can't punish us!"

[ArMaP]

Here's one of those data broker's product.

"In the demonstration of Locate X me and other journalists received recently, the tool allowed a user to lookup someone’s unique advertising identifier linked to their phone. And, the location data itself provided strong indicators of where someone lived or worked, making unmasking them trivial in many cases."

That's why the GDPR talks about "identifiable person", as the data may not directly identify a person but the volume and the different sources of data make it easy to identify a person.