A telephone , or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user.
In 1876, Alexander Graham Bell was the first to be granted a United States patent for a device that produced clearly intelligible replication of the human voice. device in history that enabled people to talk directly with each other across large distances. Telephones rapidly became indispensable to businesses, government and households.
Here is a Learning Path about historical development of phones.
You can learn invention of phone, mobile phone and smartphones also evolution of the telephone...
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