We explore the number of exchanges going into stop-sell (which means no new PSTN connections) and the number of premises impacted by this. We then explore how this will impact end-users, who will be asked to plug a Smart Router into their master phone socket, impacting anything currently connected to this, including alarm systems utilising digital communicators. Follow Installer Steve as he uses MiniAir 2 to upgrade his PSTN reliant digital communicators.