Tech Review spoke to Ramón Cáceres, a researcher at AT&T, on how his company is putting these newly acquired analytical powers to use. So far, it's mostly academic and civic research. Studying travel habits of AT&T subscribers in New York and Los Angeles, for instance, Cáceres and his team found that the average Manhattanite travels 2.5 miles on average per day, while AT&T-using Angelenos log five miles. Another study, conducted by researchers at MIT, traced location data for mobile users attending major public events like a Red Sox game, analyzing how and when they travel to and from the stadium. Data such as these is proving incredibly valuable to city planners, who previously had to rely on limited surveys which are far less accurate.