There are two types of cellular phones, analog and digital. Most people are using analog cell phones today. You enter the number you want to call and when you hit the send button, the antenna sends a signal to a "cell" or transmitter area just like trying to tune in an FM radio station. Computers switch the call to the next cell area as you move out of one cell area and into another.If you are using your phone while traveling in a car, the signal is transferred to the transmitter of the next local "cell", hopefully not interrupting the phone conversation. That is why sometimes a call may be choppy or you lose the person for a few seconds. Satellites circling the Earth also help provide communication systems for cellular phones, too.That is how a cell phone works. Cell phones are very common today and they are very different from the phones tied down by wires. Check a link on How Cellular Phones Work or Beakman's World has a good explanation of cell phones (you will need the Macromedia Shockwave Plug-in).
Outside Cell Phone