task 1.3

 Mobile Phones

List of  mobile phone networks in the UK:

·        02

·        3

·        Vodafone

·        Orange

·        T-Mobile

List of the service providers in the UK:

·        Giffgaff

·        BT mobile

·        Asda

·        Tesco

·        Virgin mobile

·        TalkTalk

List of phone manufacturers who sell phones in the UK :

·        ZTE

·        Vodafone

·        Toshiba

·        T-Mobile

·        Sony ericsson

·        Sony

·        Sonim

·        Sagem

·        Palm

·        Orange

·        O2

·        Nokia

·        LG

·        INQ

·        I-mate

·        Huawei

·        HTC

·        HP

·        Google

·        Dell

·        Asus

·        Alcatel

·        Acer

·        3

·        Samsung

·        Blackberry

·        Motorola

·        Apple

How Does A Moblie Phones Work?

Mobile phones work using "cells". Each cell has a phone mast at its centre. The phone mast sends and receives calls from your phone. Your phone communicates with the phone mast using radio waves. As your phone moves from cell to cell, your calls are transmitted from the nearest phone mast.

The size of mobile phone cells varies. Depending on weather you are in the country on in the city, in the country there can be only one main station every 10Km, but in towns they can be separated by only 500m. Each main station can only handle a limited number of calls. So in the city many people may be making calls at once, so many main stations are required to handle them. To avoid interference cells are grouped in “clusters” which each phone mast uses different frequency.