Well in Finland, there's more than one mobile phone per citizen. And still I know people without one. So some people actually have two or they might have taken the old one to a flea market or simply thrown it away, I don't know what the research is based on. Anyway, Finland has a population of about 5,300,000, and according to Wikipedia, it's on the 111th place. Long distances in less-populated areas, Nokia being a company originated in Finland, and perhaps people's stereotypical quietness when 'talking' face to face, partly explain the frequency.