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He invented a string telephone that pass on sounds over an extended wire by mechanical vibrations.
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first person that debatabled the idea of a “speaking telegraph” (telephone).
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He writes an article on the principles of the telephone.("Transmission électrique de la parole", L'Illustration, Paris, 26 August 1854).
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He displays an electric voice-operated device in New York; it is not clear what kind of device he demonstrated.
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He constructs the first speech-transmitting telephone
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Bell's U.S. Patent 161,739 "Transmitters and Receivers for Electric Telegraphs" is granted. This uses multiple vibrating steel reeds in make-break circuits, and the concept of multiplexed frequencies.
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Bell uses a bi-directional "gallows" telephone that was able to transmit "voicelike sounds", but not clear speech. Both the transmitter and the receiver were identical membrane electromagnet instruments.
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Establishes Western Electric Manufacturing Company.Also, Gray invents a liquid transmitter for use with a telephone however he does not make one.
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Bell's U.S. patent No. 174,465 for the telephone is established
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Bell transmits the sentence: "Mr. Watson, come here! I want to see you!" using a liquid transmitter and an electromagnetic receiver.
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Bell's U.S. next patent is settled for an electromagnetic telephone using permanent magnets, iron diaphragms, and a call bell.
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Edison files for a patent on a carbon (graphite) transmitter. His patent was granted on May 3, 1892, after a 15-year delay because of litigation.
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Western Electric introduced a new model "102" in 1927. It was their first phone that using a handset and combined the transmitter and receiver.
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He displays a shrore-to-ship radio telephony
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Martin Cooper, invented the first practical mobile phone for hand-held use in a non-vehicle setting, Using a modern, heavy portable handset, Cooper made the first call on a hand-held mobile phone to his rival, Dr. Joel S. Engel of Bell Labs
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The first 1G network started in the USA using the Motorola DynaTAC mobile phone.
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by NTT DoCoMo on the WCDMA standard.
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Up to 10% of telephone given to in Japan and South Korea have changed to this digital telephone service.
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Every day new, more modern and with higher technology telephones and mobiles are created. The telephone today has become a necessity for each one of us, rather than a want. Humans get intrested in electric phones, and especially in cell phones, from a very young age.Without the electric phone, our world would be lost, since many people can't even imagine their life without it.
