Guy Gorton wrote:

What is a cell phone? Used in prisons?

Oh, good grief. You use the concept in your country.

A cellular network is based on the ability of a handset to communicate
with transceivers in numerous cell sites. The coverage area is broken
up into cells. Towers are placed at the edges of the cell with the ability
to broadcast into three neighboring cells. The handset can communicate
with transceivers on any of three towers. If the wireless handset is
moving in a vehicle, the call can be handed off seemlessly as it moves
from one cell to the next.

Contrast with a marine radio that communicates with one base and a
signal that broadcasts over a larger area of water.

You aren't aware that mobile phones use a cellular network?