Just a friendly outside view that maybe it's their house and you could just assume you are talking in a public space if that fits your worldview. Otherwise you

Just a friendly outside view that maybe it's their house and you could just assume you are talking in a public space if that fits your worldview. Otherwise you may not want to talk to them on the phone if they are using android phones and should ban them from discussing anything you talked about while you were there after you're gone and they plug devices back in.