This document provides an introduction and overview of principles of wireless networks and mobile computing. It discusses the growth of wireless subscribers surpassing wired subscribers. It also describes some key challenges in wireless communication over the wireless link and handling user mobility. The document then summarizes various cellular network standards including 2G, 2.5G, 3G and 3G+. It also explains the components of a cellular network architecture including cells, base stations, mobile switching center and how calls are routed. Finally, it discusses different wireless multiple access techniques including ALOHA, slotted ALOHA and R-ALOHA and their advantages and disadvantages.