Cellular Phones
| People all around the world use cell phones, in developing countries without the infastructure of land lines they are the only phones available to many people. As handy as they are there can be pitfalls and traps you may fall into unless you do your homework and understand how the plans work that are offered to you. |
History - Buying - Downloadables - Tips & Usage
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On April 3, 1973, in a public demonstration, using a "brick"-like 30-ounce phone, Martin Cooper started the 10-year process of bringing the portable cell phone to market. In 1983 Motorola introduced the 16-ounce "DynaTAC" phone into commercial service, each phone costing the consumer $3,500. One of the most interesting things about a cell phone is that it is actually a radio -- an extremely sophisticated radio, but a radio nonetheless. Before the introduction of cell phones, people who really needed mobile-communications ability installed radio telephones in their cars. There was one central antenna tower per city, and perhaps 25 channels available on that tower. The phone in your car needed a powerful transmitter -- big enough to transmit 40 or 50 miles. It also meant that not many people could use radio telephones -- there just were not enough channels. Digital cell phones are the second generation (2G) of cellular technology. Analog systems do not fully utilize the signal between the phone and the cellular network, digital phones convert your voice into binary information (1s and 0s) and then compress it allowing between three and 10 digital cell-phone calls to occupy the space of a single analog call. Cellular Phone History & Basics
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