"JWBH" <blue.star777@REMOOOOVEvirgin.net> wrote in message
news:1FAEh.33647$3a3.26391@newsfe6-win.ntli.net...
> On the television the other day was something about how thieves are using
> something electronic to find out if someone has a satelite navigation system
> hidden in their car. I didn't get any of the details of it.
>
> I usually keep a cheap mobile phone in the glove compartment of the car, as a spare.
> Could similar means (what ever they were) be used to pick up that my phone in inside? If
> so I wouldn't leave it in the car.


If you leave your phone turned on, then yes, it can be detected by
someone with the right kind of spectrum analyzer. A phone transmits
periodically to the nearest cell tower so they know where to route
any incoming calls.

You can even detect signal leakage from devices that don't intentionally
transmit, such as a gps receiver.

Don