I mean there are non-magic ways to secure a phone line or conversation. Cell phone calls are already encrypted, which doesn’t help you if the cell company is ‘in on it’, but you can use a secure messaging app like signal to encrypt texts or calls., provided both people are using it. But lots of media acknowledges the danger of using your own device, and even goes so far as to depict characters theowing away their phone or smashing the sim card. Using a burner phone is not entirely secure but is pretty reliable since you basically become a needle in a haystack of millions of people. Somebody else mentioned person of interest though, and thats a great show that takes the premise that an ai system is eatching and aware of every communication that happens digitally, as well as all camera feeds that are hooked up to a network.