Qwest Communications International Inc. was formed in 1996 and began by installing all-digital fiber optic infrastructure alongside railway lines. This was intended to provide businesses with high-speed data services.
Headquartered in Denver, the company has since grown quickly and operates as a telecommunications carrier, providing local services to fourteen states mainly in the west of the US.
Originally founded in 1983 as Bell Atlantic Corporation when AT&T was broken up into seven 'Baby Bells', the company became Verizon Communications Inc. in June 2000.
The new company resulted from a merger with GTE, one of the largest mergers in US business history. It is now a global broadband and telecommunications provider with its headquarters in New York City.
Comcast Corporation is the largest cable operator and home Internet provider in the US and offers a number of services including cable television, broadband Internet and telephone services. In addition to the core company, Comcast also has interests in E! Entertainment Television, Style Network, The Golf Channel and more.
In addition they have recently acquired a majority stake in NBC Universal in a move which was approved by the FCC in 2011.
American Telephone and Telegraph Corporation (AT&T) is a communications company with an extremely long history. Its beginnings go back to 1875 and the development of the telephone by Alexander Graham Bell. AT&T went on to become the parent company of Bell System and remained so for many years. In 1984 the company split into eight companies and AT&T focused on offering telecommunications services and equipment.
This was a new era in telecommunication and AT&T took the initiative and started to deliver IP-solutions and is now starting to focus on the latest protocol - VoIP or Voice over Internet Protocol.