Level 3 Communications is an American multinational telecommunications and Internet service provider company headquartered in Broomfield, Colorado. It operates a Tier 1 network. The company provides core transport, IP, voice, video, and content delivery for medium-to-large Internet carriers in North America, Latin America, Europe, and selected cities in Asia. Level 3 is also the largest competitive local exchange carrier (CLEC) and the 3rd largest provider of fiber-optic internet access (based on coverage) in the United States. On October 31, 2016, CenturyLink announced an agreement to acquire Level 3 Communications in a cash and stock transaction.
AT&T Inc. is an American multinational telecommunications conglomerate, headquartered at Whitacre Tower in downtown Dallas, Texas. AT&T Inc. began its existence as Southwestern Bell Corporation, one of seven Regional Bell Operating Companies (RBOCs) created in 1983 in the divestiture of the American Telephone and Telegraph Company (founded 1885, later AT&T Corp.) following the 1982 United States v. AT&T antitrust lawsuit. Southwestern Bell changed its name to SBC Communications Inc. in 1995. In 2005, SBC purchased former parent AT&T Corp. and took on its branding, with the merged entity naming itself AT&T Inc. and using the iconic AT&T Corp. logo and stock-trading symbol. The current AT&T reconstitutes much of the former Bell System and includes ten of the original 22 Bell Operating Companies, along with the original long distance division.