Cellphone Users' Locations Tracked by Study
A study that used data on 100,000 cellphone users' locations was published in "Nature." The study found that 75% of those tracked remained within a 20-mile radius of their home. Participation in the study was nonconsensual. The research involved information provided by cellphone service providers on its users. Similar tracking of US cellphone customers is technically possible be illegal without the user's permission.
Study tracking people via cell phone raises privacy issues, CNet News.com, June 5, 2008
