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.