OnStar has partnered with RelayRides to allow its subscribers to turn their idle vehicle into an income source - without the hassle of installing expensive aftermarket hardware or having to meet a renter to hand off keys. Renters can simply unlock reserved OnStar-enabled cars with their mobile phone, access the keys, and go. RelayRides is the first third-party developer to integrate with GM OnStar's proprietary application program interface. (OnStar News Photo)

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