Wireless communications in today’s world is diverse and ubiquitous. However, its largest and most visible segment is arguably cellular mobile networks. In such networks, the coverage area consists of multiple adjacent cells, with each cell containing a fixed base station. Transmission to and from an individual mobile unit is normally between that unit and the base station that provides the best communication, and the coverage area around the base station can extend to several kilometers. Such communication is commonly referred to as mobile access and today most mobile units are the so-called smartphones, the most iconic of which is arguably the Apple iPhone. A smartphone is much more than a phone. It is a portable computing device that combines mobile telephone communications with a host of computing functions. Furthermore, in addition to mobile access, it incorporates Wi-Fi, Bluetooth, GPS navigation, and, in the case of iPhones, satellite-enabled messaging. It is the aim of this text to convey at a high level the latest technologies behind mobile access, Wi-Fi, and Bluetooth wireless communication. First, however, presented in this chapter, are brief histories of mobile access, Wi-Fi, and Bluetooth as well as a cursory look at GPS and iPhone satellite messaging technology.