Definitions of mobile phone on the Web:

• cellular telephone: a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver
  wordnetweb.princeton.edu/perl/webwn
• A mobile phone or mobile (also called cellphone and handphone) is an electronic device used for mobile telecommunications (mobile telephone, text messaging or data transmission) over a cellular network of specialized base stations known as cell sites. ...
  en.wikipedia.org/wiki/Mobile_phone
• Attributive form of mobile phone, noun
  en.wiktionary.org/wiki/mobile-phone
• A portable telephone that connects with the telephone network over radio wave transmission
  en.wiktionary.org/wiki/mobile_phone
• A cellular telephone that is permanently installed and integrated into the wiring of a motor vehicle. May be either hands free or hand held models. Also called a car phone.
  www.nhtsa.dot.gov/people/injury/research/wireless/append.htm
• The type of cellular phone that is installed in a motor vehicle. There are three main types of cellular phones mobile, transportable, and portable. A mobile unit is attached to the vehicle, draws its power from the vehicles battery and has an external antenna.
  www.college-finances.com/cell-phone.html
• The term that can be inter-changed with cellular phone or wireless phone.
  www.gpsanywhere.net/cellular_glossary.html
• This is a portable phone that usually the cellular or satellite networks to transmit data such as a voice conversation or SMS.
  www.digital10.com/index.php
• enter mobile phone number information (xxx-xxx-xxxx)
  www.bedbathandbeyond.com/bridalToolKit/btUploadDef.asp