Don K <dk@dont_bother_me.com> wrote
> JWBH <blue.star777@REMOOOOVEvirgin.net> wrote

>> 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.

Its more complicated than that in practice with hordes of other phones doing
that too, and that not happening very often at all with a particular phone.

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

Again, it isnt that easy to work out which car its coming from tho.