Don't be naïve. 1. the telcos have months - if not years - of LAC update data stored for every phone. They know where you sleep, who visits and where you work

Don't be naïve. 1. the telcos have months - if not years - of LAC update data stored for every phone. They know where you sleep, who visits and where you work and shop; 2. they analyse the CDR for every call/SMS send and received (caller and receiving party cells) [look at your spam SMS with a jaundiced eye]; 3. they 'ping' thousands of phones* daily to trilaterate the location to metres (and/or A-GPS, TDOA, etc.) 4. they analyse the voice and data handover records. * The preferred way to do this with a veneer of deniability is for the authorities to add in a few phones into the known associates list of phones to be monitored in an otherwise legitimate drug or terrorist warrant. They judges will never know (and certainly don't ask).