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AT&T
For more than a century, AT&T has been providing the world with communication services. It is the largest communications holding company in the world by revenue. The company offers a portfolio of services to personal consumers, small businesses and multinational companies. Its services include broadband, wireless networks, retail, international service plans, long distance, support and service, and more. The company's global headquarters is located in Dallas, Texas, and worldwide it has more than 200,000 employees.