"Researchers at MIT may not be able to hear your cellphone call,but they have found a way to see it",MIT's news office reports."They mapped a city in real time by tracking tens of thousands of people traveling about carrying cellphones.Using anonymous cellphone data provided by the leading cellphone operator in Austria,A1/Mobilkom, the researchers developed the Mobile Landscapes project,creating electronic maps of cellphone use in the metropolitan area of Graz,Austria,the country's second-largest city.

MIT researchers map city by cellphone