The destructive way: open up the unit and destroy the mic, either by prying it loose from the pcb, or just smashing it if it's too integrated. On my Fairphone I

The destructive way: open up the unit and destroy the mic, either by prying it loose from the pcb, or just smashing it if it's too integrated. On my Fairphone I think it was a small metal box with a little hole on top.