TRW PhonePrint (fwd)

[David Koontz]

>Each cellular telephone emits unique signal transmission characteristics - an
>electronic version of a human fingerprint - which cannot be duplicated.  These
>characteristics are matched with the mobile identification number (MIN) and the
>electronic serial number (ENS) of the phone to develop a unique pattern for
>each legitimate customer

I would take it that this would have to operate at the cell level?