Book excerpt: Mobile devices’ impact on daily life has raised relevant questions regarding public and private space and communication. Both the technological environment (operating systems, platforms, apps) and media ecosystems (interface design, participatory culture, social media) influence how users deal with the public and private, intimate and personal spheres. Leading researchers in communication, art, computer engineering, education, law, sociology, philosophy, and psychology here explore current methodologies for studying the dichotomy of the public and private in mobile communication, providing a foundation for further research.