Cell phones are hand-held telephone devices with built-in antennas. They are often called wireless, mobile, or PCS phones. Cell phones are popular with callers, especially those who are frequently on the go, since they can be carried easily from one place to another.
Basically, cell phones are two-way radios. When you talk into a wireless telephone, it picks up your voice and converts the sound to radio frequency energy or radio waves. The radio waves then travel through the air until they reach a receiver at a nearby base station. From here, it is the base station that sends your call through the telephone network until it reaches the person you are calling. Health Concerns over Cell Phones The most recent issue about cell phones is their perceived health hazards. As stated earlier, cell phones are radios. However, to be more accurate, cell phones are low-power, single-channel, two-way radio devices. When you talk on your cell phone, you are actually talking to a nearby base station. Cell phone base stations are low-power, multi-channel, two-way radios. 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