20-10-2017, 11:41 PM
24-10-2017, 03:46 PM
A cell phone known as a cell phone in North America. It is a portable telephone that can make and receive calls through a radio frequency link while the user is moving within a telephone service area. The radiofrequency link establishes a connection to the switching systems of a mobile telephone operator, which provides access to the public switched telephone network (PSTN). Modern mobile phone services use a cellular network architecture and therefore, mobile phones are called cell phones or cell phones in North America. In addition to telephony, mobile phones in the 2000s support a variety of other services, such as text messaging, MMS, e-mail, Internet access, short-range wireless communications (infrared, Bluetooth), commercial applications, video games and Digital photography. Mobile phones that only offer these capabilities are known as feature phones; mobile phones that offer very advanced computer skills are known as smartphones.
The first handheld mobile phone was proven by John F. Mitchell and Martin Cooper of Motorola in 1973, using a weighing phone c. 2 kilograms (4.4 lbs). In 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. From 1983 to 2014, worldwide mobile subscriptions grew to over seven billion, penetrating 100% of the world's population and even reaching the foot of the economic pyramid. In the first quarter of 2016, the major smartphone manufacturers were Samsung, Apple and Huawei (and "mobile device sales accounted for 78 percent of total mobile phone sales").