Are Mobile Phones Really Just Tracking Devices?
"A mobile phone is a hard problem. I don't see a way that mobile phones can work and not have the phone system know where the phone is. But we could legally require the system to not notice where the phone is, unless the phone calls 9-1-1, or if a court has ordered surveillance of that particular phone. Otherwise, it should not figure out where the phone is, and not remember anything about the call. We have to limit the collection of data if we want to prevent its abuse. ... These limits, if we follow the Bill of Rights, will allow data to be collected when courts order specific data to be collected. But, they should not allow data to be collected about everybody, in general, all the time."