You've missed my point. Of course the telecom itself, for many purposes - not the least of which is billing - needs to know a personal identity behind a SIM ca

You've missed my point. Of course the telecom itself, for many purposes - not the least of which is billing - needs to know a personal identity behind a SIM card. What I am saying is that individual cell sites - and other pieces of the cellular infrastructure - are only indirectly (or not at all) connected to personal identity of the mobile subscriber. Call routing can be done just fine without any idea of subscriber identity in meatspace.