https://motherboard.vice.com/en_us/article/nepab8/att-stop-selling-location-data-tmobile-sprint-microbilt-zumigo

On Tuesday, Motherboard revealed that T-Mobile, AT&T, and Sprint were all selling their customers’ phone location data that ultimately ended up in the hands of bounty hunters, as well as people unauthorized to handle it at all. We found this by purchasing the capability to locate a phone from the black market for just $300. In response, several senators called for the Federal Communications Commission (FCC) to investigate, and brought up the prospect of greater regulation of the telecommunications industry.

Now, AT&T says it is stopping the sale of all location data to so-called location aggregators, companies that sit in the supply chain between the telcos and clients, and which play a vital role in having that data trickle down to end users.