Kickin' Ass and Takin' Names wrote:

>
>
> And how do they measure "the distance of the phone from nearby base
> stations. . . ?"

Without repeating the spammers URL they use triangulation (the speed of
light is a constant so you can deduce how far away you are from a radio
transmitter etc). It gives much coarser results than GPS. It is at least
something because say you bought a recent Blackberry from VZW which
has a real GPS built in that is disabled at VZWs request.