This document provides an overview of mobile technology and mobile phones. It begins with introductions and definitions of technology. It describes how mobile technology has evolved from early two-way pagers to modern smartphones. The first mobile phones used analog 1G technology in the 1980s, followed by digital 2G technology in the 1990s. 3G technology enabled data transfer beyond just calls. Major mobile phone manufacturers include Motorola, Nokia, Apple, and Samsung. Mobile phones connect to cellular networks and can be used for calls, text, cameras, internet, games, and more. The document concludes by noting both benefits and potential harms of mobile phone use.