Before you consider to upgrade the DoorBell Fon staion with new IdoorBell + or you plan to install the IDooBell + Phone. Read the this first then follow by the Configuration, Connection, and Setting App. You have to have at least four wires (if you are upgrading the existing DoorBell Fon which means plus original … Continue reading 1. The world only Vieo DoorBell + Phone Preparation-