Verizon Communications Incorporated, founded with the 2000 merger of Bell Atlantic Corporation and GTE Corporation, provides over 63 million residential, business, and government clients across the United States with wireline, wireless, DSL, broadband, and other voice and data communications services. The company offers customers high-speed Internet access, dedicated access, remote virtual private network (VPN), toll-free calling, text messaging, ringtone, on-demand movie, directory, website hosting, security management, and e-commerce services. The firm includes the Verizon Wireless, Verizon Business, and Verizon Telecom units. Verizon Wireless operates a digital network that encompasses 160 switching facilities and 23,000 cell sites. The network serves over 51 million customers across the United States. Verizon Business serves mid-sized businesses, corporations, and government agencies. The Verizon Telecom unit operates a wireline broadband and video network that supports local telephone, nationwide long distance calling, data, and other services. The unit serves customers in 28 states and the District of Columbia. Verizon Communications' International business unit serves clients in the Americas and in Europe. The Information Services unit oversees print publishing, SuperPages (R) directory, SuperPages.com (R) online directory and search, and other operations. Verizon Communications acquired MCI Incorporated in 2006. Verizon Communications is based in New York. The firm maintains operations in 150 countries. The company's shares are traded on the New York Stock Exchange under the VZ symbol. Verizon Communications was added to the Dow Jones Industrial Average list in 2004.