Mobile Phones

Topics: Mobile phone, Cellular network, Radio Pages: 4 (1326 words) Published: March 4, 2013
Try to describe how and explain why,in the past thirty years,we have moved from a situation where the mobile phone did not exist,upto to today when almost everyone has one and it has become a necessity

This essay will discuss the Mobile phone and look at its origins and analyse how it has evolved over time to become a necessity in the present day. A Mobile Phone or cellular phone is a device that is used to make and receive telephone calls over a radio link over a wide geographical area.It does this by connecting to a cellular network provided by a mobile Phone operator like MTN,CellZ and Airtel in Zambia.A mobile phone can also connect to a public telephone network i.e Land line.In Zambia,Zamtel provides Land line telephone services. In the early days,communication of speech by radio link was mainly used by the Military using hand and held radio transceivers.These were also used for transmiting radio waves from land to the ship on the seas.Early communication devices of this nature were bulky and required colossal amount of energy.They also supported only a few simultaneous conversations.Modern day Mobile phone networks are able to accommodate multiple conversations and can also be used for data communication. For many of us, it's hard to imagine a time before cell phones. Until very recently, most of the people who carried mobile communication devices were people who needed them specifically to perform their jobs people like freight truck drivers and police. Before cell phones, many people used radio telephones for mobile communications. These were installed in cars, so that people could communicate from construction sites or get much-needed help during emergency situations. Decades ago, a single tower with perhaps two dozen frequencies could control the radio telephone communications for a whole city. Citizens' band (CB) radios were often used by long-haul truckers and became popular with the general public in the late 1970s. Essentially, a CB radio is a...
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