A very clever viral from the people at Vodaphone - could be very dangerous if we all chose to operate our cars in this way, although it may help for the times when you have lost your car in the supermarket car park. You just have to hope you don't mislay your phone. Also not sure what happens if you receive a call during your driving, as suppose the same rule applies - only use the phone if its hands free, and certainly no texting whilst driving.
