Mobile radio system most often used nowadays for telephony, which has rapidly supplemented landline telecommunications as a means of two-way personal communications. Cellular networks works on the principle and use the physics of two-way radio communications and is named after the unit 'cell' into which an area is divided. As a mobile radio telephone moves through this pattern of cells, its user's calls, made as on an ordinary telephone, are switched from one cell to the next by a computerised system. (http://www.jisc.ac.uk/p...)