You could just conduct your shady business conversations in the middle of an open field and don't allow your buddy to bring his phone 
You're on a computer (I guess) and possibly have speakers. You could just google for white noise and crank it.
You could just conduct your shady business conversations in the middle of an open field and don't allow your buddy to bring his phone You're on a computer (I guess) and possibly have speakers. You could just google for white noise and crank it.