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Cellular technology involves the re-use of radio channels over and over again.
This can be done by using very low transmitter power: the radio waves can only travel a few kilometers and then be re-used.
One of the limitations of the mobile phone is that you cannot make a call if the transmitter signals from the phone and carrier are not strong enough.
More and more communication systems are based on the use of computers: they play an important role in relaying signals quickly, efficiently and with reliability.