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Mobile Phones

Feb 22, 2008
Did you know that the cell phones have a longer history then the radio? Yes, the radios were first introduced in 1921 but the technology for the cell phones is traced back to 1920. Police used some of the cell phone features on their radios back in the 1940s.

The idea of the cellular phone was developed in 1947 as a mobile car phone. Bell Laboratories (also known as Bell Labs and formerly known as AT&T Bell Laboratories and Bell Telephone Laboratories) produced the concept of the cellular phone by introducing cells for mobile phone base stations. Russell Ohl developed the photovoltaic cell (a device that converts light energy into electrical energy.) In 1943, Bell developed SIGSALY (also known as the X System, Project X, Ciphony I, and the Green Hornet), the first digital scrambled speech transmission system used in World War II for the highest-level Allied communications. SIGSALY is not an acronym. It was intended to look like an acrynim but it was just a cover name. SIG was common in Army Signal Corps names. The prototype was called Green Hornet because it sounded like a buzzing hornet to anyone trying to eavesdrop on the conversation. Motorola has a long history of making automotive radio, especially two-way radios for taxicabs and police cruisers. The first actual cell phone was invented in 1973 by Martin Cooper of Motorola and other assisting inventors. It was called the "radio telephone system." He used the idea of the car phone and applied the technology required to make a portable cell phone a reality.

In April 3, 1973, Cooper was the first person to make a call on a portable cell phone on to the amazement of the people walking on a New York City street. That first call was made on the first Motorola DynaTAC prototype to the head of research, Joel Engel, of the AT&T Bell Lab. This caused the technology and communications market to shift away from the place and toward the person. Cooper's vision for personal wireless communications was born.

AMPS (Advanced Mobile System) was used and it introduced the first commercial network in Chicago in 1978. Analog as a name the mobile phone was known as. Various digital standards have come into play so there is a less desire for the analog mobile phone in North America.

The public was introduces to the large and expensive cellphone in 1984 when it made its presence. Towers war built by the cooperation of AT&T and the FCC. Something know as a "cell" or an area was created by the towers and covered a few miles. What was great was that the towers were able to transfer calls from each other.

Just another view, the GPS Cell phone is widely being known today.
About the Author
The background of the cell phone is incredible. They have advanced so far that there is a prepaid cell phones today.
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