The document discusses how mobile devices are gaining new sensors that can sense the environment, like location services, cameras, and environmental analysis. This will open up possibilities for tracking health outbreaks, real-time weather monitoring across hundreds of millions of users, and crowd data collection. However, connecting and networking hundreds of millions of sensor-enabled devices presents big challenges around security, commercial uses, and enabling more global participation. Mobile devices are poised to revolutionize sensing capabilities and enable new models for emerging markets that have different infrastructure needs.