with no help from the service provider, using open source software and a cheap cell phone, researchers were able to “..track the location of a test subject within a 10-block area as the subject traveled across an area of Minneapolis at a walking pace. “

working for motorola in 2001 i was well aware that the FCC mandated all phones track users which folks are just noticing. *possibly* unrelatedly i haven’t owned a cell phone since leaving ( actually, not really the reason why but i can talk no further 🙂