Cell
Phones
The
mobile phone, cellular phone, or simply cell phone is a long-range,
portable electronic device used for mobile communication that
uses a network of specialized base stations known as cell
sites. In addition to the standard voice function of a telephone,
current mobile phones can support many additional services
such as SMS for text messaging, email, packet switching for
access to the Internet, and MMS for sending and receiving
photos and video. Most current mobile phones connect to a
cellular network of base stations (cell sites), which is in
turn interconnected to the public switched telephone network
(PSTN) (the exception is satellite phones).
Nokia
Corporation is currently the world's largest manufacturer
of mobile telephones, with a global device market share of
approximately 36% in Q1 of 2007. Other mobile phone manufacturers
include Apple Inc., Audiovox (now UT Starcom), Benefon, BenQ-Siemens,
High Tech Computer Corporation (HTC), Fujitsu, Kyocera, LG
Mobile, Mitsubishi, Motorola, NEC, Neonode, Panasonic (Matsushita
Electric), Pantech Curitel, Philips, Research In Motion, Sagem,
Samsung, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech,
Sonim Technologies, Sony Ericsson, T&A Alcatel, and Toshiba.
There are also specialist communication systems related to
(but distinct from) mobile phones.
The
mobile phone manufacturers can be grouped into two. The top
five are available in practically all countries and comprise
about 75% of all phones sold. A second tier of small manufacturers
exists with phones mostly sold only in specific regions or
for niche markets. The top five in order of market share are
Nokia, Samsung, Motorola, SonyEricsson and LG.
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