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Mobile phones
A mobile or cellular telephone is a long-range, portable
electronic device for personal telecommunications over long
distances. It is of great use to many people.
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 are satellite phones). Cellular networks were
first introduced in the early to mid 1980s (the 1G
generation). Prior mobile phones operating without a
cellular network (the so-called 0G generation), such as
Mobile Telephone Service, date back to 1945. Until the mid
to late 1980s, most mobile phones were sufficiently large
that they were permanently installed in vehicles as car
phones. With the advance of miniaturization, currently the
vast majority of mobile phones are handheld. In addition to
the standard voice function of a telephone, a mobile phone
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.
The world's largest mobile phone manufacturers include
Audiovox, BenQ-Siemens, High Tech Computer Corporation,
Fujitsu, Kyocera, LG, Motorola, NEC, i-mate, Nokia,
Panasonic (Matsushita Electric), Pantech Curitel, Philips,
Sagem, Samsung, Sanyo, Sharp, Siemens SK Teletech, Sony
Ericsson, T&A Alcatel, T-Mobile, and Toshiba.
The world's largest mobile phone operators (based on
customer totals) include China Mobile, Vodafone, and China
Unicom.
There are also specialist communication systems related to,
but distinct from mobile phones, such as Professional
Mobile Radio. Mobile phones are also distinct from cordless
telephones, which generally operate only within a limited
range of a specific base station. Technically, the term
mobile phone includes such devices as satellite phones and
pre-cellular mobile phones such as those operating via MTS
which do not have a cellular network, whereas the related
term cell(ular) phone does not. In practice, the two terms
are used nearly interchangeably, with the preferred term
varying by location. There are lots of different networks
on mobile phones. Some are pay as you go, where you can buy
top ups and add them to your phone, so there is no monthly
bill, and some are pay monthly. This means you get a bill
every month for how much calls and texts you make.
Martin Cooper is widely considered to be the inventor of
the cell phone. Using a modern, if somewhat heavy portable
handset, Cooper made the first call on a cell phone in
1973. At the time he made his call, Cooper was working as
Motorola's General Manager of its Communications Division.
Motorola had developed the idea of using cellular
communications on a portable platform (i.e., a handset)in a
non-vehicle setting.
Bluetooth Cellular and Wireless Mobile Phones
Bluetooth Cellular Wireless Mobile Phones, Cellphones, Cell
Phones, Ericsson, Nokia, Sony, SonyEricsson, Motorola.
www.palowireless.com/bluetooth/phones.asp
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