what is mobile?
A mobile phone , cell phone , cellphone , or hand phone , sometimes shortened to simply mobile , cell or just phone , is a portable telephone that can make and receive calls over a radio frequency link 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). Modern mobile telephone services use a cellular network architecture, and, therefore, mobile telephones are called cellular telephones or cell phones , in North America. In addition to telephony , 2000s-era mobile phones support a variety of other services , such as text messaging , MMS , email , Internet access , short-range wireless communications ( infrared , Bluetooth ), business app...