This document contains lecture notes on mobile communications and wireless networking. It discusses the history of wireless communications from early signaling methods to the development of radio networks and cellular systems. Key developments covered include the first commercial cellular network in Japan in 1979, the 1G analog AMPS standard from 1983, the transition to 2G digital cellular standards in the 1990s, and the shift from analog to digital modulation. It also covers concepts such as frequency reuse, modulation techniques, and the frequency-domain properties of digital signals.