Investor's Business Daily - Smart phone users could soon use their phones as a car key for a rental car. Car-sharing service company Zipcar will offer a free iPhone application that will let its clients identify available cars in its parking lots, reserve one they want and pay for it, MSNBC.com says. Special electronic controllers installed in shared cars let customers unlock the car they reserved. Also, the iChange, a concept car created by automaker Rinspeed, features an iPhone dock that starts the car.
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