This is probably a question that forms on most newcomers lips as they anxiously fondle their smartphone and walk up to the first day on set or stage. “Why use this intercom when I have a phone?” The answer used to be very clear in the past; if you are on a call and a third person needs you, they will find you blocked. You cannot run a show, manage a stage, choreograph an event or coordinate a rocket launch without someone else in the same ‘project’ being able to talk or alert you at any ...