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About The Innovation A mobile phone is a portable telephone that works using a series of radio networks or cells. The term “cell” refers to the geographical area covered by the network base station that contains the radio equipment serving the cell. Australians commonly refer to this device as their “mobile”, while in the USA its known as a “cell phone”. Mobile phones are essentially a type of radio. With ground based mobile networks, the phones exchange radio signals with towers within geographical “cells”. A phone can pass from one cell to another without losing the call. Mobile phones are able to use one frequency for talking and another for listening, allowing both parties to talk at the same time. This is known as ‘duplex’ capability. All mobile phones have: ü An earpiece ü A microphone ü A transceiver ü An antenna (commonly in-built) ü A battery The early models of cellular phones included large battery packs and carrying cases, and were very expensive, around $5000. It had a handset hooked up to a battery with the dial pad on it. Handheld mobile phones were invented in 1973 by Dr. Martin Cooper (pictured). There was no display, talk time was limited to 35 minutes, rechargin