This document summarizes mobile usage trends in 2011, including a decline in SMS usage for events like New Year's greetings and an increase in smartphone adoption. It notes that teens in Western countries are increasingly using messaging apps instead of voice calls for communication and that social networks will help accelerate the growth of mobile VoIP. Overall, it suggests that while SMS and voice calls are not dead, traditional phone calls are declining as users prefer faster, more asynchronous forms of mobile communication like messaging.