Things change when you're not connected to the phone company's
> lines. Cell phone users, for example, are connected to their wireless
> provider. Until recently, the best the wireless company could do was
> to have a general idea of the area of the caller, accurate perhaps to
> several square miles. Now, with more accurate location being mandated,
> phones can be located using other means, including GPS (Global
> Positioning System) receivers embedded in many phones.
GPS works only outdoors in a relatively open area. It never works indoors except perhaps when right next to a very large window with plain glass.
This is the problem with technology that is not well understood by those who propose using it for solutions under less than robust circumstances.