The phone has been invented the hypothesis that one day. Bell noticed that the sound is caused by vibration of piano wire. Therefore, it's probably the wire conductor Audio from one place to another. With this principle, he had an idea to create a transmit sound waves, is leading to the flat, which has a magnetic sheet metals are. A wire coil and the magnet round again, and when the sound waves cause vibrations of metal. Vibration causes Electric current in a wire around a magnet, and then flows through the wire, another one where the receiver and the receiver will have a similar duty to change the electricity back into the system. And here's the dude is the hypothesis of work, pick up the phone "Graham Bell".
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