Phone carriers collect a minute-by-minute record of everywhere you go. If you use GPS on your phone, that may be obvious. But carriers are also selling that information to companies that don’t do much to keep it secure. One of those companies, Securus Technologies, was hacked this month. Securus gets its information from a company called LocationSmart. On Friday, security researcher Brian Krebs reported a bug on LocationSmart’s website that would make it possible to track any phone on the four major carriers using only a phone number. Krebs spoke with Marketplace Tech host Molly Wood about the dangers this kind of data can pose in the wrong hands. (05/22/2018)