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AT&T Inc. (originally the American Telephone and Telegraph Company) is an American multinational telecommunications holding company that is Delaware-registered but headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company and the largest provider of mobile telephone services in the U.S.

Dan Borislow and Donald Burns. Website. Official website. MagicJack is an Internet-based telephone service (VoIP) provider in the United States and Canada. It is a computer peripheral that, in combination with telephony service from the related YMAX Corporation, provides VoIP services. In 2011 the company introduced MagicJack Plus, which no ...

Clearwire Corporation (stylized as clearw˙re) was a telecommunications operator which provided mobile and fixed wireless broadband communications services to retail and wholesale customers in the United States, Belgium, Ireland and Spain. Clearwire traces its roots to 1998, when Sierra Technologies, Inc., spun off certain assets to form a new ...

An Internet service provider ( ISP) is an organization that provides services for accessing, using, or participating in the Internet. ISPs can be organized in various forms, such as commercial, community-owned, non-profit, or otherwise privately owned . Internet services typically provided by ISPs can include Internet access, Internet transit ...