Report : It 's easy to identify smartphone users by their movements . Then maybe you go to the same church , or restaurant for brunch , every Sunday . They're usually in a hurry, and they tend to be on the move all day long. Each mobile user 's daily movements are unique and create a `` fingerprint '' Privacy advocates worry how law enforcement and others may use that data .
Report : It 's easy to identify smartphone users by their movements . They're usually in a hurry, and they tend to be on the move all day long. Each mobile user 's daily movements are unique and create a `` fingerprint '' Privacy advocates worry how law enforcement and others may use that data .