If you're truly paranoid about it, you could keep you phone in a Faraday cage or something like a Mylar bag to block all external signals. But that would really

If you're truly paranoid about it, you could keep you phone in a Faraday cage or something like a Mylar bag to block all external signals. But that would really only be for those moments when you want to be off grid. That would otherwise defeat the purpose of having a phone.