This document discusses emerging mobile technologies and trends for teens, including smart phones, QR codes, augmented reality, and location-based services. It provides examples of how libraries can implement these technologies, such as using QR codes to link to the catalog, databases, and other online resources. The document also addresses challenges libraries may face with supporting various mobile devices and platforms. Overall, the key points are how mobile technologies are changing how teens access and use information and how libraries can adapt services to engage teens on their mobile devices.