They all "phone home" so to speak. Thats how they get the live traffic data, from speeds of phones traveling on the road. An important note, you dont need to use an app, your phone, tablet, vehicle, are all live tracked, for use in GPS routes, traffic signal timing, regional transportation management center, ect.
Sure, if you drive something pre 08, have No phone, or anything else with a simcard, you can be under the radar to an extent; but with Flock LPRs and vehicle fingerprinting, your still tracked