Why Papa John's and Domino's are all about digital pizza ordering

I can't remember the last time I called someone on the phone to place an order for pizza. Papa John's told investors during its first-quarter earnings call that 55% of its total sales now come through digital. Sixty percent of those digital transactions came from mobile devices. Competing pizza chains Domino's and Yum! Brands' Pizza Hut are also investing heavily in e-commerce. Both have invested in ordering methods for smartwatches, connected cars, and video game systems.