The mobile phone,
cellular phone, or simply cell phone is a long-range, portable
electronic device used for mobile communication that uses a network of
specialized base stations known as cell sites. In addition to the
standard voice function of a telephone, current mobile phones 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.
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 is satellite phones).