Why I have repeatedly stated there is no such thing as “anonymized location data”

In the data drawn from apps, each cellphone is typically represented by an alphanumeric identifier that isn’t linked to the name of the cellphone’s owner. But the movement patterns of a phone over time can allow analysts to deduce its ownership—for example, where the phone is located during the evenings and overnight is likely where the phone-owner lives.

Source: U.S. Government Contractor Embedded Software in Apps to Track Phones – WSJ