What you can do is file your n900 to the shape of your car key, give the customised n900 to someone and then say "Go over there and start my car".

(a) The car can be started with your n900 and
(b) can be done remotely.

Have you tried wearing somethink skimpy like a thong or maybe a pole-dance?



Ok I should be serious.

You would need some kind of hardware hack for the engine computer?
I know that most(all?) remote-control car alarms transmit an encrypted key (which changes everytime it's used) to the computer.

Interesting idea though!