On the eve of Apple’s unveiling of the iPhone 5, 45% of American adults own smartphones. They are particularly popular with young adults and those living in relatively higher income households; 66% of those ages 18-29 own smartphones, and 68% of those living in households earning $75,000 also own them.
Read the full report, Smartphones Popular With Young Adults, Higher-Income Households, on the Pew Research Center's Internet & American Life Project website.