I don't think thats true, at all, you can look up how long they keep records of your calls/texts, it's public knowledge. And, if theres no signed, official, warrant on a wiretap, and you aren't on some terrorist shyt which supersedes everything, the evidence is inadmissible for an indictment, and a conviction.
That guy saying 'there is a way' to find out what was said and the government recording all calls are two really separate things.