By David Talbot, Technology Review
Cell-phone data could be used for development, transportation planning, and public health. Around the world, some mobile carriers have been releasing anonymized records of cell-phone data to researchers. The data releases are not all the same, but can include records of which phones connected to which cell phone towers, providing a trace of caller movements; with whom the connection was made, providing a map of social networks; and what purchases were made, even through simple phones, providing a glimpse of economic activity. In many cases, such data is unavailable from any other source.
http://www.technologyreview.com/news/514646/glimpses-of-a-world-revealed-by-cell-phone-data/
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