MOBILE PHONE:

History: - Cellular Phone - Some kind of wireless communication that is familiar to mobile
phone users. It's called 'cellular' because the system uses many base
stations to divide a service area into multiple 'cells'

Year of 1947: Crude mobile (car) phones were looked by one researcher and
realized that by using small cells (range of service area) with frequency
reuse they could increase the traffic capacity of mobile phones
substantially. However at that time, the technology to do so was nonexistent.
AT&T proposed that the FCC allocate a large number of radio-
spectrum frequencies so that widespread mobile telephone service would
become feasible and AT&T would have a incentive to research the new
technology.

To limit the amount of frequencies available is decided by FCC

Year of 1977: A prototype cellular system were constructed by AT&T and Bell Labs

Year of 1979: In Tokyo, the first commercial cellular telephone system was began the
operation

Year of 1981: Motorola and American Radio telephone started a second U.S.
cellular radio-telephone system test in the Washington/Baltimore area

Year of 1982: Commercial cellular service were finally authorized by FCC for the USA

Year of 1983: First American commercial analog cellular service or
AMPS (Advanced Mobile Phone Service) was made available in
Chicago by Ameritech

Year of 1990: 2G were began to introduced such as GSM, IS-136("TDMA"), iDEN and IS-95
("CDMA")

Year of 2001: NTT DoCoMo in Japan branded FOMA launched the first pre-commercial 3G
network

Category: - Cellular Phone Mobile Phone Handphone

Impact of advantage: - Most of the people use to communicate to other people on other
place with easier and better way. Without any kind of phones will
be troublesome thats why it is being widely used all over the world

- The handphone is small and easier to bring anywhere you want

Impact of disadvantage: - The percentage of receiving a call is not 100%

- Handphone cannot be used for some place such as in the movie
theatres,hospital, some school

- Handphones has its own health risks of handphone radiation


References:

-http://inventors.about.com/gi/dynamic/offsite.htm

-http://www.arcx.com/sites/Technical%2520Comparison.htm

-http://gek15110.tripod.com/id2.html

-http://www.itu.int/telecom-wt99/press_service/information_for_the_press/ press_kit/backgrounders/backgrounders/social_impact_mobile.html

-Mobile phone - Wikipedia, the free encyclopedia