Yes, but this data is held by the cell phone companies. Based on the article, this is using "data from apps in accordance with their legal agreements" so that d

Yes, but this data is held by the cell phone companies. Based on the article, this is using "data from apps in accordance with their legal agreements" so that doesn't seem to be the source. I hope cell phone companies require warrants for the data (they should per Carpenter v. United States) although I don't really trust them.