"Everyone that carries a cell phone is already tracked. The police use this to locate anyone they want. They can check the computer logs to see who was near the scene of a crime, or who is not being truthful about their whereabouts."
Oh, piffle. They aren't doing this. The potential is there, I suppose, but there aren't enough computers on the planet to monitor where everyone is at any given time.
As for me, I don't carry a cell phone, anyhow. I know of nobody who absolutely must be able to speak to me anytime or anyplace.
You MUST be joking. Your cell phone calls - at least the digital ones - can be readily triangulated.