Use an end-to-end encrypted voice communications App other than the standard cell phone service for your calls.
They still get to know who you are talking to, and for how long, and who they or you talk to subsequently, when, and for how long. But they don’t know what you’re saying.
Unless they bother to bounce a laser off your window from two miles away and you can’t even see them, at which point they can also hear your conversation.
And if you are still worried at that point, you should ask yourself if being a criminal/terrorist/dissident/etc. is worth all the angst you are causing yourself in terms of obsessing about your conversation being overheard.
Personally I’d just buy a new burner phone, and go somewhere noisy and make the call from there instead of worrying about how to prevent a tap on your daily use phone.
They still get to know who you are talking to, and for how long,
Suggested edit: add “and when”
Good point. Traffic analysis is to establish connections between the communications and the subsequent events, if any.
…subsequent events, if any.
Also correlations with preceding and concurrent events. Knowing local time also is useful in establishing circumstances surrounding the location of communication, which can be triangulated (or quickly estimated by signal strength and round-trip time to known antenna providing cell phone service). The cell phone model can also be fingerprinted from traffic analysis and the crypted payload doesn’t obscure the frame envelope.
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From the top:
Security of one’s communications is hard enough to establish, folks. The thing of it is that you really have to have plausible deniability in case something goes wrong.
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Will Myers
Intelligent Design and Biblical Scripture 