Really? Do you want a real-world example have a look at US White House: > President Obama talks on the phone aboard Air Force One. April 10, 2014. > The Air

Really? Do you want a real-world example have a look at US White House: > President Obama talks on the phone aboard Air Force One. April 10, 2014. > The Airborne Executive Phone has the red light on, which means it's a secure call. https://www.electrospaces.net/2017/01/the-presidential-communications.html https://www.electrospaces.net/2017/01/the-presidential-commu... It is further made more clear because NSA literally calls their secure network the red network.