'It’s a scene we’re sure you’ve witnessed again and again:
A family is sitting in a restaurant having dinner. The four year old is clearly fed up with sitting, and starts to complain, jump on her seat or run around. But a few moments later, she’s quietly in her seat again, enabling her parents and older siblings to enjoy a peaceful meal and conversation for the next 30 minutes.
Her father handed her his iPhone.'
You can read more about how these devices affect children here.