Telephone facts for kids

Cordless phone

Older telephone

A telephone, also known as a phone, is a communication tool. Originally it was an electric tool transmitting analogue speech along wires. Now it is an electronic tool sending digital signals on wires or radio transmission. Using a telephone, two people who are in different places can talk to each other. Early telephones needed to be connected with wires which are called fixed or landline telephones. Modern mobile phones use radio waves.

History

Alexander Graham Bell was the first person to patent the telephone, in 1876. Early telephones were wired directly to each other and could only talk to the phone that they were connected to. Later, telephone exchanges allowed connecting to other telephones. During the 20th century the machines that made the connections were automated.

Types of telephones

There are many different types of telephone. A telephone that can be carried around is called a mobile phone or cell phone. These became popular in the late 1980s. It has become common for people to carry mobile phones and in some places it is unusual to not have one. The majority are smartphones, which can be used as computers. Some mobile phones are able to make telephone calls using communications satellites instead of masts on the ground, which means people can make calls from anywhere in the world.

In most countries there are public payphones. To use one, people pay with coins, a credit card or a prepaid card.

Computers can use a machine called a modem or a Digital subscriber line router to talk to other computers over a telephone line. This allows a computer to connect to other computer networks including the Internet.

Most countries have a telephone network. The telephones in one place are connected to a telephone exchange. The exchanges are connected together in a world-wide network. In less developed countries cell phones are used as a cheaper and faster way to connect the countryside to the network.

Telephone number

Most telephones have their own number. Today, telephone numbers are about seven to ten digits long. In many countries, part of the telephone number is called the area code. Area codes are used to make sure the numbers are not the same in two different places. Areas have their own area code, and countries have their own country code.

Usage

By the end of 2009, there were a total of nearly 6 billion mobile and fixed-line telephone subscribers worldwide. This included 1.26 billion fixed-line subscribers and 4.6 billion mobile subscribers.

Images for kids

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  A rotary dial telephone, c. 1940s

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  Schematic of a landline telephone installation

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  Alexander Graham Bell's Telephone Patent Drawing

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  Bell placing the first New York to Chicago telephone call in 1892

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  Reis' telephone

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  Acoustic telephone ad, The Consolidated Telephone Co., Jersey City, New Jersey, 1886

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  An IP desktop telephone attached to a computer network, with touch-tone dialing

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  Ericsson DBH 1001 (ca. 1931), the first combined telephone made with a Bakelite housing and handset.

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  Telephone used by American soldiers (WWII, Minalin, Pampanga, Philippines)

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  Modern sound-powered emergency telephone

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  One type of mobile phone, called a cell phone

See also

In Spanish: Teléfono para niños