Motherboard just posted an article claiming that T-Mobile, Sprint, and AT&T are selling customer data that ultimately allows individuals to geolocate U.S. phones with nothing but a phone number. Journalist Joseph Cox gave a phone number and $300 to a "bounty hunter," and quickly got a Google Maps screenshot with a relatively accurate location of the phone back. Apparently, major telecommunication providers are selling geolocation "services" to a number of private companies, and those services end up being resold on the black market without their knowledge.