This document discusses mobile phone usage and the shift towards mobile performance support for learning. The key points are: 1) As of 2011, there were over 5.9 billion mobile subscriptions globally, with a penetration rate of 87% worldwide and 79% in developing countries. 2) Children in the US are now more likely to own a mobile phone than a book. 3) Performance support provides access to knowledge at the point of need, giving a competitive advantage over traditional training which relies on memorization. 4) Learning has shifted from "pushes" of formal training to "pulls" of on-demand, informal learning through performance support and guidance from others.