If one is extremely paranoid and pedant not even land lines are private. Ignoring the fact that they have to know who you call to bill you, everything nowadays goes through VOIP. You're not safe even with encrypted chat apps as Tucker has shown. Good luck if you need that level of privacy. For most of us just getting rid of tracking from Google, Apple, and other unsophisticated actors doing what I said gets the job done just fine.
If one is extremely paranoid and pedant not even land lines are private. Ignoring the fact that they have to know who you call to bill you, everything nowadays goes through VOIP. You're not safe even with encrypted chat apps as Tucker has shown. Good luck if you need that level of privacy. For most of us just getting rid of tracking from Google, Apple, and other unsophisticated actors doing what I said gets the job done just fine.