OnStar Corporation is a subsidiary of General Motors that provides subscription-based communications, in-vehicle security, emergency services, hands-free calling, turn-by-turn navigation, and remote diagnostics systems throughout the United States, Canada, China, Mexico, Europe, Brazil, and Argentina. Customer service: 1 (888) 466-7827 Parent organization: General Motors Headquarters: Detroit, MI Founded: 1996 Founders: General Motors, Electronic Data Systems, Hughes Electronics Subsidiaries: OnStar Global Services Corp, Shanghai OnStar Telematics Co., Ltd

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