Gifty Rani31/03/2010

Introduction Facts Generations Wrapping Up References

What are Cell Phones? Also known as mobile phones or wireless

phones Hand-held phones with built-in aerial Can be carried from place to place Makes it easier for people who want to be

in touch with relatives when they are away from the house

How Do Cell Phones Work? cell phones are actually two-way radios

Radio - simplex system (single frequency )

Cell Phone - duplex system (two frequency )

“Dr. Martin Cooper of Motorola, made the first US analogue mobile phone call on a larger prototype model in 1973. This is a reenactment in 2000” (Wikipedia, The Free Encyclopedia).

“Cellular technology was undeveloped until the 1960s, when Richard H. Frenkiel and Joel S. Engel of Bell Labs developed the electronics” (Explain That Stuff).

“Recognizable mobile phones with direct dialing have existed at least since the 1950s” (Explain That Stuff).

‘The first cell phone was named the DynaTAC8000X. It was created by Martin Cooper in 1984” (Explain That Stuff).

“The first, major flip phones was the Nokia 9000 Communicator. It was created in the late 1980’s. It was popular but still cost $3,000” (Explain That Stuff).

“The first person to have a mobile phone in the United Kingdom was reputedly Prince Philip” (Explain That Stuff).

“The first fully automatic mobile phone system, called MTA (Mobile Telephone system),was developed by Ericsson and commercially released in Sweden in 1956” (Explain That Stuff).

“In 1958, The weight of radiophone improved "light" handset was about 500 grams and maximum 30 phone numbers could save” (Explain That Stuff).

“In 1966,One base station, connected to one telephone wire line, could serve up to six customers”(Explain That Stuff).

“In 1967, each mobile phone had to stay within the cell area serviced by one base station throughout the phone call”(Explain That Stuff).

“Battery needed to be charged for 10 hours. Talk time- 1 hour! The phone cost $3,995” (Explain That Stuff).

“Main article: 1G”

“On April 3, 1973, Motorola employee Dr. Martin Cooper placed a call to Dr. Joel S. Engel, head of research at AT&T's Bell Labs, while walking the streets of New York City talking on the first Motorola in front of reporters. Motorola has a long history of making automotive radios, especially two-way radios for taxicabs and police cruisers”(Wikipedia, The Free Encyclopedia).

“Main articles: 2G, 2.5G, and 2.75G

“The second generation introduced a new variant to communication, as  “SMS”( Short Messaging System) text messaging became possible, initially on “GSM”( Global System for Mobile Communications) networks and eventually on all digital networks” (Wikipedia, The Free Encyclopedia).

“2G also introduced the ability to access media content on mobile phones, when Finland introduced the downloadable ring tone as paid content” (Wikipedia, The Free Encyclopedia).

“Finland was also the first country where advertising appeared on the mobile phone when a free daily news headline service on SMS(Short Messaging System) text messaging was launched in 2000, sponsored by advertising” (Wikipedia, The Free Encyclopedia).

Main article: 3G

“Not long after the introduction of 2G networks, projects began to develop third generation (3G) systems” (Wikipedia, The Free Encyclopedia).

“The first pre-commercial trial network with 3G was launched by “NTT” (Nippon Telegraph and Telephone) in Japan in the Tokyo region in May 2001” (Wikipedia, The Free Encyclopedia).

“By the end of 2007 there were 295 Million subscribers on 3G networks worldwide, which reflected 9% of the total worldwide subscriber base” (Wikipedia, The Free Encyclopedia).

improvement over the telecommunications technology

daily becoming a fixture of modern life help to better communicate with the

important people in your life are convenient and in today's society

they are almost a necessity among the business world and everyday normal life

http://en.wikipedia.org/wiki/History_of_mobile_phones

http://www.jancorver.org/ombouw/nokia/img/nokia.gif

http://www.explainthatstuff.com/cellphones.html http://ezinearticles.com/?An-Introduction-to-Cell-

Phones&id=318143 http://www.howitworks.net/how-cell-phones-

work.html

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