Should parents let toddlers play with iPhones?

Parents are finding out that a new app, 'Toy of Choice', can amuse there little kids for hours. They can press buttons to see the screen light up, watch videos, or do educational apps, But a new study says it can be as neglectful as putting them in front of a tv for a few hours. Kids don't need anymore screen time and need to learn how to interact with the outside world. Do they really need a iGo Potty app?