AT&T Inc. is an American multinational conglomerate holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company, the second largest provider of mobile telephone services, and the largest provider of fixed telephone services in the United States through AT&T Communications. Through recent acquisitions of DirecTV and Time Warner, AT&T has positioned themselves as a leader in the entertainment world, consistently winning JD Powers award for customer satisfaction. Recently, AT&T has signed a contract with the Federal Government as the exclusive provider of FirstNet. A network designed for First Responders by First Responders, ensuring communication in critical moments.