http://americanhistory.si.edu/collections/search/object/nmah_704159
https://www.britannica.com/biography/Alexander-Graham-Bell
https://www.encyclopedia.com/science-and-technology/computers-and-electrical-engineering/electrical-engineering/telephones
The Internet is an endless hole of information and sometimes you don't get the answers you're looking for. Today I tried to find out what materials the first telephone was made out of. The Internet gave me many different answers. This answer appears in more than one website so I hope this is true.
"Bell created a magnetic telephone which was the precursor to modern phones. This design consists of a transmitter, receiver and a magnet. The transmitter and receiver contain a diaphragm which is a metal disk. The vibrations of the callers voice cause the diaphragm in the transmitter to move."
Nowadays phones contain a microphone, an earpiece and are touch screen
Phones have gone through many design changes over the years and they keep getting smaller and more high tech.
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