AT&T Inc. operates as one a premier communications, holding company. Located in Washington, D.C., the company operates through a number of subsidiaries that render services to customers across the United States and around the world. IT is one of the leading providers of wireless, Wi-Fi, high-speed Internet and voice services. In addition to mobile broadband, it offers worldwide wireless coverage services. AT&T Inc. also offers advanced television services under the AT&T U-verse and AT&T DIRECTV brands.