“A vast body of research has shown [mobility] data is highly reidentifiable. Previously, researchers showed that knowing four random points of someone’s trajectory points, such as when and where you take your morning coffee, was enough to uniquely identify that person 95% of the time in a dataset of 1.5 million people. Other studies have

Ars Technica reported yesterday about a graduate student at Indiana University’s School of Informatics and Computing that has compiled documents and recordings obtained through Freedom of Information Act requests that support that Sprint/Nextel has provided GPS location data about Sprint’s wireless customers to law enforcement over eight (8) million times in just over one year.
Continue Reading Alleged that Sprint Provided Law Enforcement Customer GPS Data over 8 Million Times