It actually refers to the way the telephone radio network is arranged. Instead of having a single very powerful transmitter to cover a large area, mobile phone companies split the area into small "cells"; each with its own transmitter. This means lower power settings, and allows the same frequencies to be re-used in different parts of the area.
By the way, I'm not sure what you mean by this :"as every cellphone one of so many cellphones as a cell is for the body."
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