[admax88q]

Why is it legal for them to collect that data in the first place? Can't sell, abuse, or accidentally leak that which you don't have.

[dredmorbius]

AT&T maintain a comprehensive database of call level history dating to the 1980s.

Certainly to resolve customer billing disputes, I'm sure.

https://www.eff.org/cases/hemisphere

https://en.wikipedia.org/wiki/Call_detail_record

http://epic.org/privacy/nsa/Section-215-Order-to-Verizon.pdf