Now that’s the car accessory that iPhone owners would love to have. This $300 addon (i.e. Viper Smart Start) to your car and a free iPhone app can together empower you to control your car using your cellphone. You can turn on the car, lock / unlock doors or trunk, turn on climate control before you reach the car (this means you walk into a warm car, all winter long) or manage the car alarm.
All communications are carrier over cellular network and this can be a great prank tool on your friends who borrow your car. Video is below: