This document discusses the evolution of mobile devices over the past 30 years. It notes that mobile phones have decreased dramatically in size and price since first being introduced, and now have many more capabilities beyond voice calls. These additional functions like messaging, internet access, and apps have increased users' exposure to security risks. Modern smartphones combine the features of phones, PDAs, and laptops into compact devices that store large amounts of personal data. While manufacturers try to secure these platforms, some users seek to bypass controls for more flexibility. The growth of BYOD has also increased risks and complexities for organizations. Users must be aware of risks, and organizations must educate and secure devices and data.