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phons
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how does a modern telephone work
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Landline phones: http://communication.howstuffworks.com/telepho ne.htm
Cell (mobile) Phones: http://www.howstuffworks.com/cell-phone.htm
Landline phones: http://communication.howstuffworks.com/telepho ne.htm
Cell (mobile) Phones: http://www.howstuffworks.com/cell-phone.htm