GM’s OnStar is perhaps the best known, but some other companies offer their own versions. There’s usually a monthly fee involved after an initial trial period. Assistance systems commonly include accident notification (a call is automatically made to a service center if the vehicle’s airbag goes off due to an accident) and vehicle tracking in the event it’s stolen. They also typically allow you to speak to someone to get information about your vehicle, help with directions, or even obtain concierge services such as making restaurant reservations.