Like to switch phones?
Take out the battery after comms?
Only activate your phone in certain places.
That's how they get you. Did you know that the phone company records the difference between a power down signal and a removed battery?
Did you know that very infrequent power on and offs are recorded in a database?
Did you know that when you first turn on a phone it links it to that location and in turn links it to previous numbers from that location?
Registration analysis is then performed to see if any of these new phones are activated in similar locations as old sketchy phones? They also check to see if the new number calls any of the old numbers and perform call chain analysis on the numbers.
If you aren't careful, your burner is burned as soon you turn it on.
One phone for each contact. Always turn it on in a random location.
thanks Snowden