Eh? Conventional pocket pagers are receive only. This is well known. Oh, they probably do emit tiny amounts of RF from their local oscillators, but I doubt much could be done with that. Cell phones, on the other hand, *do* tell the system which cell you are in, and they can do this even when you're not in a call. It's called "registration". The usual purpose is benign: directing pages (land-to-mobile call requests) only to the cell you're in, instead of having to "flood" them all over the system. But it *could* be used to keep track of your location. I carry both a pager and a cell phone. Normally I keep the cell phone turned off to save its batteries. When I get a page, I can turn the phone on and return the call. The pager/cellphone combination is very nice, as I effectively get "caller ID" functionality. Even better, *I* get to choose when, how or even if to answer a particular page. And since pagers are unidirectional (no acks) I can always lie about not having gotten a page from somebody I don't want to talk to! :-) Phil