Eighty-five percent of Americans currently own cell phones . The study also found that the average American spends about $350 a year on phone bills, and that people who use their smartphones for more than an hour per day are twice as likely to have high Five percent of Americans own e-reader devices such as the Kindle or Nook .
Eighty-five percent of Americans currently own cell phones . About a quarter of all U.S. households have gone mobile phone-only . Five percent of Americans own e-reader devices such as the Kindle or Nook .