@xyzzy How about therapists putting their and your phones in a soundproof box for the duration of the session? Simple lowtech solution for that cyberpunk problem.
@xyzzy Does that switch the microphone off, or just the network connection? In the latter case, the phone could still record the whole session and transmit the conversation as soon as there's a network again (/paranoia)
@SaniTea their recommendation was to put your phone on airplane mode.