I remember being taught (though I can't really vouch for the accuracy of the lesson) that 'cell' phones were so named because they'd only function in a particular 'cell,' or 'limited-area-of-coverage-offered-by-a-particular-company-because-American-phone-companies-are-reluctant-to-share-infrastructure-unlike-Australian-ones.' More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.