Transcript Evolution of Technology

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Dr. Martin Cooper invented the first portable cell
phone in April 1973.
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Born December 26, 1928 (age 82)
Residence Chicago, Illinois, USA
Nationality American
Education Illinois Institute of Technology
Occupation Inventor Entrepreneur
Employer Motorola CEO & founder of Array Comm
Known for Inventing the handheld cellular Mobile Phone
Title Engineer
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A mobile phone (also called mobile, cellular telephone, or cell
phone) is an electronic device used for two way radio
telecommunication over a cellular network of base stations known
as cell sites.
Mobile phones differ from cordless telephones, which only offer
telephone service within limited range through a single base station
attached to a fixed land line, for example within a home or an office.
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Mobile telephones are two-way radios.
When you talk into a mobile telephone, it picks up your voice and
converts the sound to radiofrequency energy (or radio waves).
The radio waves travel through the air until they reach a receiver at
a nearby base station. The base station then sends your call through
the telephone network until it reaches the person you are calling.
When you receive a call on your mobile phone, the message travels
through the telephone network until it reaches a base station close
to your phone.
The base station then sends out radio waves that are detected by a
receiver in your telephone, where the signals are changed back into
voice or data.
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1843 Micheal Faraday a talented chemist begins researching the possibility that
space can conduct electricity.
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1865 A Virginia Dentist/Scientist, Dr. Mahlon Loomis, develops a method of
communicating through the earth’s atmosphere by using an electrical conductor.
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1921 The Police Department in Detroit, Mich. begins installing mobile radios,
operating around 2 MHz, in their squad cars.
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1947 AT&T comes out with the first radio-car-phones that can be used only on the
highway between New York and Boston; they are known as push-to-talk phones.
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1956 The first real car phones, not car radios, come into play accross the United
States.
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1971 AT&T is the first company to propose a modern-day mobile-phone system to
the FCC. It involves dividing cities into “cells”. It is the first company to do so.
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1973 Dr. Martin Cooper invents the first personal handset while working for
Motorola.
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2001 BellSouth announces that it is leaving the pay phone business because there
is too much competition from cell phones.
Pro’s
Con’s
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Good to have for emergencies
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Disturbance
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People can always reach you when
needed
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No service in certain areas
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Hidden charges
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Stylish
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They can damage your ear
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Internet connection
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Expensive
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Can be used worldwide
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It can fit in your pocket.
People use the phone while they are
driving, and this can cause problems.
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Very enjoyable
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A cell phone is not only useful but also an excellent safety device. If the electricity goes
out, a cell phone will still work when a cordless phone will not.
The invention of the cell phone is credited to Dr. Martin Cooper, who worked for
Motorola at the time. The first cell phones were very large compared to modern cell
phones. The call was made to one of Cooper's rivals, who at the time worked for Bell
Labs.
Cell phones do more than just make phone calls. Texting allows two or more people to
type out messages and send them to another phone. Games, phone wallpapers and
custom ringtones are available to download.
According to the Columbia Encyclopedia, Cell phones operate on the same principle as
a radio. The phone sends out radio signals which are transported to the receiving cell
phone.
Cell phones come with a basic warranty that covers defects for a certain period of time.
The phone warranty does not include damages caused by the owner, such as dropping
the phone and breaking it. It also does not cover water damage. While a cell phone can
still be saved if it is submerged in water, a sticker located inside the phone changes color
to alert the company that the phone has received water damage and the warranty is
void.
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eHow.com: Cell Phone Facts | eHow.com http://www.ehow.com/about_5366897_cellphone.html#ixzz1BaTJRZpl
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Wikianswers.com:
http://wiki.answers.com/Q/What_are_the_advantages_and_disadvantages_of_using_mobile_
phones
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Yahoo.com:
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