Telephone is the instrument that sends and receives voice messages and data. Telephone convert speech and data to electrical energy which is sent great distances. All telephone are linked by complex witching systems called central offices or exchanges, which establish the pathway for information to travel. Telephones are used for casual. Conversation to conduct ,business and to sum man help in emergency. The telephone has other uses that do not involve one person talking to another including paying bills and retrieving massages from an answering machine. Telephone is one of the fastest means of communication. we can t
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