Samsung S5620 Monte mobile phone

Cell phone service areas are divided into "cells," each of which is serviced by a base station. When you make a call, your cell phone selects the strongest basestation it can find, which is usually the closest station to you.If you move out of the coverage of one base station, your phone switches to thenext strongest available base station (which usually means you move into a newcell). The system always knows your location relative to the nearest cell.