Bitcoin is just one of those things in life that involve a lot of sensitive information that needs to be kept from the constant presence of adversaries.
The whole concept of bitcoin itself is built on the foundation of cryptography. A and B talking, with C knowing fuck-all.
What would you say is the most safe tool to use if I want to communicate sensitive information to someone with my voice?
This thread can also serve as discussion for best practices when verbally communicating bitcoin.
~best
If the communication is somewhat asynchronous, you could get away with recording your voice, encrypting the file, and sending that.
Of course it is not super practical for a one to one communication. In that case, the best is to go to somewhere private, or where there probably isn't any device spying on you, say for example take a hike to a national park, or in the middle of a forest.
But the best of all is to not say you own Bitcoin.