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Alexander Graham Bell was the first person to design the telephone and his intent was to make communication more efficient and transmit speech electrically.The telegraph was the invented and was basically a wire based electrical system that would transmit signals. http://inventors.about.com/od/bstartinventors/a/telephone.htm
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The touch tone phone was invented right after the the telephone and it uses voice frequency to transmit sounds. This phone had buttons to type in the digits. http://inventors.about.com/od/bstartinventors/a/telephone_3.htm
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It was invented by a jazz musician named Teri Pall.The Federal Communications Commission granted the frequency range of 47-49 MHz for the new and improved telephone (the cordless phone). It was a lot more efficient because it used a lower amount of energy and the phones didn't have as much interference as the the touch tone phone. http://inventors.about.com/od/bstartinventors/a/telephone_3.htm
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the cell phone uses a large number of radio spectrum frequencies to make the cell phone feasible.It was created by at and t and you could only have maximum number of 23 conversations at a time.
http://inventors.about.com/od/famousinventions/fl/The-History-of-Cellular-Phones.htm -
In 1989 Motorola came up with the idea to make a mouthpiece that could be flipped over with the top which was used for texting.This ides was brought up by Motorola.
http://www.softschools.com/timelines/cell_phone_timeline/28/ -
In 2007 apple designed the first smart phone known as the iphone it constied of one button and was touch screen. it changed phones forever.
http://www.thesnugg.com/a-brief-history-of-smartphones.aspx
