The document traces the evolution of mobile phones from 1973 to 2015, beginning with early Motorola cell phones in the 1980s that were large and expensive, to the first smartphones by IBM and BellSouth in 1993. It highlights several important models through the decades that advanced features like touchscreens, apps, and cameras. These include the Motorola StarTAC in 1996 as the first clamshell phone, the Nokia 8210 and 5110 that popularized customization, and the iconic Motorola Razr in 2004. The document concludes that the 2007 Apple iPhone revolutionized the industry by establishing the modern smartphone format.