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A company called Bladox is selling an auto alarm kit for cellphones that uses an accelerometer to determine if your car or bike has been taken without your permission, then uses the phone to call or leave an SMS to any of a variety of pre-programmed numbers. Even better, they sell it as a kit for tinkerers, too, so if you want to wire the phone and motion detector into the rest of your vehicle's circuitry you can. Or if you just want to leave an old cellphone stashed inside your car somewhere, the company sells clip-on backs to many common phones with the circuits integrated inside.

The lesson of all this is: always throw away any mobile phones you see inside a car you've just stolen, preferably into the bin of a truck moving in the opposite direction.

Product Page [Bladox]
Prom??te sv?j telefon v autoalarm (Czech) [IdnesCZ]