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.
A mobile phone allows its user to make and receive telephone calls to and from the
public telephone network which includes other mobiles and
fixed-line phones across the world. It does this by connecting to a
cellular network owned by a
mobile network operator. A key feature of the cellular network is that it enables seamless telephone calls even when the user is moving around wide areas via a process known as
handoff or handover.
In addition to being a telephone, modern mobile phones also support many additional
services, and
accessories, such as
SMS (or
text) messages,
e-mail,
Internet access, gaming,
Bluetooth and
infrared short range wireless communication, camera,
MMS messaging,
MP3 player,
radio and
GPS. Low-end mobile phones are often referred to as
feature phones, whereas high-end mobile phones that offer more advanced computing ability are referred to as
smartphones.
The first handheld mobile phone was demonstrated by
Dr. Martin Cooper of
Motorola in 1973, using a handset weighing 2 kg (4.4 lb).
[1] Motorola released the first commercially available mobile phone, the
DynaTAC 8000x, in 1983. In the year 1990, 12.4 million people worldwide had cellular subscriptions.
[2] By the end of 2009, less than 20 years later, the number of mobile cellular subscriptions worldwide reached approximately 4.6 billion, 370 times the 1990 number, penetrating the
developing economies and reaching the
bottom of the economic pyramid.
[3]
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