This document traces the evolution of mobile phones from 1876 to the present day. It outlines key milestones such as Graham Bell's telephone in 1876, the introduction of rotary and touchtone dialing, and early mobile phones from Sony, Motorola, and Nokia. It then discusses the rise of smartphones with the iPod and iPhone. The document also covers distinctive features of mobile interactions such as limited input/output and the strong influence of context. Finally, it provides references for further reading on mobile computing and interface design.