Single-line business touch-tone telephone with message waiting light.

The telephone is a telecommunications device that is used to transmit and receive electronically or digitally encoded sound between two or more people conversing. It is one of the most common household appliances in the developed world today. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other user. Graphic symbols used to designate telephone service or phone-related information in print, signs, and other media include , , , and .

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