Telephone - Wikipedia
A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly.

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Telephone | History, Definition, Invention, Uses, & Facts | Britannica
Telephone, an instrument designed for the simultaneous transmission and reception of the human voice. It has become the most widely used telecommunications device in the world, and billions of telephones are in use.

The History of the Telephone and How It Was Invented - ThoughtCo
Alexander Graham Bell beat Elisha Gray in patenting the telephone, dominating its history. Bell's knowledge of sound helped him improve the telegraph, leading to the telephone's invention. The invention of the telephone led to rapid industry growth, eventually forming AT&T's monopoly.

How Telephones Work - HowStuffWorks
Telephones are one of the most important and useful modern inventions. Learn about telephone operation, creating a telephone network and tones and bandwidth.

How do telephones work? - Explain that Stuff
An easy-to-understand introduction to how telephones and telephone exchanges work, with photos showing what's inside a typical phone.

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Telephone - New World Encyclopedia
The telephone (or phone) (from Greek: tele = far away; phone = voice) is a telecommunications device that is used to transmit and receive sounds (most commonly voice and speech) across distances.

Invention of the Telephone: Complete History and Timeline
The telephone is the most popular and widely used means of communication, that has literally changed the world and brought it closer. There have been numerous modifications in the structure and design of the telephone since the time it was first made.