Four of the country's largest cellular providers have been selling your real-time location information, allowing a Texas-based prison technology company, Securus, to track any phone "within seconds," without a warrant. The system uses data sold by AT&T, Sprint, T-Mobile, Verizon and other carriers - who provide it through an intermediary called LocationSmart.
The service can find the whereabouts of almost any cellphone in the country within seconds. It does this by going through a system typically used by marketers and other companies to get location data from major cellphone carriers, including AT&T, Sprint, T-Mobile and Verizon, documents show. -New York Times
Last week Sen. Ron Wyden (D-OR) sent a letter to the FCC demanding an investigation into Securus, after the New York Times revealed that former Mississippi County sheriff Cory Hutcheson used the service almost a dozen time to track the phones of other officers, and even targeted a judge.