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For technologies related to the telephone, see the articles mobile telephone, videophone, fax and modem. For discussion of broader technologies, see the articles telecommunications system and telecommunications media. In addition it describes the development of what is known as the public switched telephone network (PSTN). This article describes the functional components of the modern telephone and traces the historical development of the telephone instrument. Billions of telephones are in use around the world. As a result, it has become the most widely used telecommunications device in the world. 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. Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. Learn how Alexander Graham Bell went to revolutionize telegraphy but instead invented the telephone See all videos for this article SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.

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COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.

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