This document discusses the use of mobile devices in medicine. It provides a history of mobile devices from PDAs in the 1980s to current smartphones and tablet PCs. It describes how these devices can be used by doctors to access medical references and records, enter patient data, and communicate. Emerging applications of mobile devices include social networking, geopositioning, and integration with electronic medical records and wireless networks. The document suggests future opportunities for mobile devices to improve care coordination, communication between doctors and patients, and data sharing during emergencies.