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AT&T Inc. summary

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Below is the article summary. For the full article, see AT&T Corporation.
computer and mobile phone
mobile telephone Summary
Mobile telephone, portable device for connecting to a telecommunications network in order to transmit and receive voice, video, or other data. Mobile phones typically connect to the public switched telephone network (PSTN) through one of two categories: cellular telephone systems or global
Block diagram of a digital telecommunications system.
telecommunication Summary
Telecommunication, science and practice of transmitting information by electromagnetic means. Modern telecommunication centres on the problems involved in transmitting large volumes of information over long distances without damaging loss due to noise and interference. The basic components of a
Alexander Graham Bell and the New York City–Chicago telephone link
telephone Summary
Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. The telephone is inexpensive, is simple to operate, and offers its users an immediate, personal type of communication that cannot be obtained through any other medium. As a result, it has become
Corporate board room with an executive giving a presentation on a digital interactive whiteboard showing charts and graphs.
corporation (C corp) Summary
A corporation is a legal form of business organization, chartered by a state, that exists as a separate entity from its owners. In the United States, the default corporate form is the C corporation (C corp), named for the subchapter of the Internal Revenue Code that governs its taxation.