If like most people you keep your cell phone handy, your mobile-service provider knows where you are nearly all the time. And several major cell companies are selling that information to firms that sell it onward in a practice that could let stalkers and criminals find out your location in real time, according to a new report.

“A wide variety of companies can access cell phone location data, and … the information trickles down from cell phone providers to a wide array of smaller players, who don’t necessarily have the correct safeguards in place to protect that data,” Motherboard reported Tuesday.

AT&T, T-Mobile and Sprint are among the cell-service firms reportedly peddling the data, according to the tech website. Car salesmen, property managers, bail bondsmen and bounty hunters are among the groups of people ultimately buying the location data, Motherboard reported.