The video above was made using data from the traces of mobile calls in Geneva, Switzerland.  Besides being extrodinarly beautiful, the video demonstrates the breadth of mobile use in modern cities.  I post this because almost every topic related to smart cities assumes robust mobile networks.

Residents can use the data illustrated in the video above for applications ranging from traffic jam detectors to figuring out what the hottest restaurant, bar, or club is on any particular evening

Meanwhile, city planners can think about urban spaces using these digital mobile traces and build cities to work around the needs of citizens