I mean, it's called a microphone and it's in every phone. There's really nothing you can do about it if the government wants to spy on you, other than find a way to block all RF transmissions. What you can do is delete any application made by Facebook, since that scummy company has been proven to use the microphone to spy on what you say and sell you targeted ads, if you have their applications installed. Who needs Facebook anyway when you have Steemit?