Phone pirates in seek and steal mission

This sounds fishy. One wonders how the “crooks” are detecting electronics equipment that’s turned off and stored in the trunk.
CEN News : Region-wide : Phone pirates in seek and steal mission
Mobile phone technology is being used by thieves to seek out and steal laptops locked in cars in Cambridgeshire.
Up-to-date mobiles often have Bluetooth technology, which allows other compatible devices, including laptops, to link up and exchange information, and log on to the internet.
But thieves in Cambridge have cottoned on to an alternative use for the function, using it as a scanner which will let them know if another Bluetooth device is locked in a car boot.
Det Sgt Al Funge, from Cambridge’s crime investigation unit, said: “There have been a number of instances of this new technology being used to identify cars which have valuable electronics, including laptops, inside.