This document summarizes key findings from Pew Research Center surveys about Americans' use of mobile devices. It finds that cell phone ownership is near ubiquitous, with 84% of Americans owning cell phones. Smartphone ownership has risen significantly, with over 1/3 of Americans now owning smartphones. Mobile internet use is also widespread, with over 2/3 of Americans using the internet wirelessly. The document outlines trends in how Americans use their phones for various activities like social media, apps, photos, videos and location-based services. It also discusses the meaning users attach to their mobile devices and how mobile is changing relationships with information.