Eduction for you

A mobile phone is a telephone that can make and receive calls over a radio frequency carrier while the user is moving within a telephone service area. The radio frequency link establishes a connection to the switching systems of a mobile phone operator , which provides access to the public switched telephone network (PSTN). Most modern mobile telephone services use a cellular network architecture, and therefore mobile telephones are often also called cellular telephones or cell phones . In addition to telephony , modern mobile phones support a variety of other services , such as text messaging , MMS , email , Internet access , short-range wireless communications ( infrared , Bluetooth ), business applications, gaming, and photography. Mobile phones which offer these and more general computing capabilities are referred to as smartphones . The first handheld mobile phone was demonstrated by John F. Mitchell [1] [2] and Martin Cooper of Motorola in 1973, using a handset w...