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Signals were firs sent along wires by the telegraph.
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Bell's was the first patent of the telephone.Bell's first telephone had combined mouthpiece and earpiece. When you spoke into the horn, the voice was converted into electric signals wich were carried along telephone wires.
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Thomas Edison made a telephone with separate mouthpiece, and one year later all telephone calls had to go through an operator.
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In 1896 the first dial phones werw used and by the 1920s, 'cradle' phones were popular in Europe and the USA.Nowdays, many telephone circuits are connected by fibre-optic cables.
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The mobile phones were invented in USA, in the Bell Telephone Laboratories.The first mobiles could centainly not fit in your pocket.