https://www.techdirt.com/articles/20190207/07313141546/wireless-carriers-busted-sharing-user-911-location-data.shtml

Recent scandals involving companies like Securus and LocationSmart made it clear that cellular carriers are collecting and selling an ocean of user location data without any meaningful oversight. Several reports have highlighted how that data is then being routinely abused by everybody from ethically dubious local Sheriffs to bounty hunters. Subsequent investigations have shown how easy it is for bounty hunters and others to access this data, and how the FCC under several administrations has failed utterly to hold cellular carriers and data brokers accountable for any of it.

This week, Motherboard exposed another location data scandal with a report highlighting how cellular carriers are also selling private user A-GPS data with companies that aren't supposed to have access to it. A-GPS, or assisted GPS, involves using a device's onboard GPS chip as well as cellular network data to more quickly and precisely determine a user's location. Wireless industry filings with the government indicate this data can pinpoint a user's location indoors up to 50 meters; more precisely if a device's MAC and Bluetooth data are also utilized.