How does a telephone work inside?

How does a telephone really work?

• I want to know like how can you talk to someone thats thousands of miles away from you through a telephone, like how does your voice travel? How does the telephone work?

• Answer:

  The voice parts of the telephone are in the handset, and consist of a transmitter (often called microphone) and a receiver. The transmitter, powered from the line, puts out an electric current which varies in response to the acoustic pressure waves produced by the voice. The resulting variations in electric current are transmitted along the telephone line to the other phone, where they are fed into the coil of the receiver, which is a miniature loudspeaker. The varying electric current in the coil causes it to move back and forth, reproducing the acoustic pressure waves of the transmitter.