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Signals were first sent along wires. The invention inspired people to try and send not jut signal about the human voice along the wire.
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Johann Reis (Germany), Antonio Meucci (Italy), Elisha Gray (USA) and Alexander Graham Bell (Scotland) were all trying out but, Bell's was granted the first patent in 1876.
This telephone had one combined mouthpiece and earpiece. <img src="https://ids.si.edu/ids/deliveryService?id=NMAH-JN2014-3618" alt="Alexander Graham Bell Experimental Telephone | National Museum of American History"/> -
He made a telephone with a separate mouthpiece and earpiece. In the 1880s, all telephone calls had to go though an operator. It was impossible to make a private call.
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They were used and by the 1920s, 'cradle' telephones were popular in Europe and the USA.
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It was invented at the Bell telephone laborateries in the USA. The first mobiles could certainly not fit in your pocket. The new generations of this mobile phone can carry voice messages, text messages, photos, videos, games and connect with internet.