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Cellular Telephones

One of the most versatile ways your boss can communicate while away from the office is by using a cellular telephone. Cellular telephones use radio frequencies to communicate with a cellular telephone network consisting of various microwave radio towers spaced throughout a city or region. These are called cells. When a call is being made, the telephone first establishes a radio link with one of the cellular transmission towers. The cell then connects the telephone with the regular telephone system to make the call. Calls are received in much the same manner.

There are many different types of cellular phones. Some models include text messaging, small computer display screens, computer keyboards, and even digital cameras (see Figure 9-2). Various attachments allow a cellular telephone to be used inside a car. For example, power can be provided from the car's cigarette lighter, and an external antenna can be connected to increase the telephone's range. Many have a hands-free feature, which allows a speaker and microphone to be connected inside a car. Most cellular telephones also have memory for storing frequently called numbers.


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