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by: RaymondSabo
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Word Count: 380

Mobile Phones

Cell phones have had a longer history then the radio. Back in 1920, the cell phones started and the radios weren't used until 1921. Of course, some of the features of the cell phone were utilized as far back as the 1940s. Those radios were used by the police.

In 1947 the idea of the cellular phone was developed as a mobile car phone. The concept of the cellular phone was produced by Bell Laboratories (also known as AT&T Bell) they introduced the cells for mobile phone stations. A device that converts light energy into electrical energy was developed by Russell Ohl. When trying to eavesdrop on the conversation there was a buzzing hornet sound and because of this the prototype was called Green Hornet. A long history of Motorola making automotive radio as two-way radios for taxicabs and police is amazing. In 1973 the actual cell phone was invented by Martin Cooper and other assisting inventors of Motorola. The "radio telephone system" is what it was called

On a New York City street to the amazement of the people walking, Cooper was the first person to make a call on the portable cell phone. The Motorola DynaTAC prototype was used. He made the call to Joel Engel of the AT&T Bell Lab. From this technology there was a shift from the workplace to the person. The birth of personal wireless communications from the vision of Cooper, was born.

In 1978, Bell Labs introduced the first commercial cellular network in Chicago using AMPS (Advanced Mobile Phone System). This was an analog mobile phone system. It became the primary analog mobile phone system in North America and is still widely available today, although it's used much less since the introduction of various digital standards.

In 1984 cell phones made its presence to the public but they were very expensive and huge. AT&T and Bell Towers work with the FCC to build towers. There was little power from the towers and they covered a "cell" which covered a few miles in radius. The towers were able to transfer calls from one tower to another.

On a side note, today Cell phone GPS is becoming very popular worldwide.

http://www.cellphones-mp3.com - Ray Sabo

About the Author

The background of the mobile phone is amazing. They have progressed so far that there is a prepaid cell phones today.

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