A cellular network is based on dividing the coverage area into numerous slightly overlapping cells. A base station (aka cell tower) within each cell provides coverage to all the devices inside the cell and hands off responsibility to a neighboring cell when the user moves.
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Cells can be as small as a room, or as large as 22+ miles (35+ km) in diameter. In congested or urban areas, smaller cells are used to allow for more people to use the network simultaneously.
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