cell phone

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A portable telephone that sends and receives radio signals through a network of short-range transmitters located in overlapping cells throughout a region, with a central station making connections to regular telephone lines.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A portable, wireless telephone, which changes antenna connections seamlessly during travel from one radio reception cell to another without losing the party-to-party call connection.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb call up by using a cellular phone