https://thenextweb.com/security/2018/06/23/supreme-court-rules-cops-need-a-warrant-to-get-phone-location-data/

In a colossal victory for privacy advocates, the Supreme Court ruled today in favor of requiring law enforcement to have a warrant before accessing mobile phone location data from telecom providers.

The decision today was actually a reversal of a previous ruling from two lower courts. In a string of Radio Shack robberies, courts convicted Timothy Carpenter of the crime based on evidence obtained from is cellular provider. Investigators managed to secure 12,898 location points that helped to track Carpenter over 127 days, putting him near four of the robbery locations.