Every working day, somewhere between a quarter and two-thirds of the phone calls placed to America's plumbers, electricians, and HVAC shops go unanswered, and the revenue attached to them does not wait politely for a callback. It is not lost to bad marketing. It is not the product of lazy technicians. It evaporates in the gap between the moment a homeowner with a flooded basement dials the first number on the search page and the moment a dispatcher decides who is sent, when, and in what order, b...