We think we know everything about smartphones. We use them constantly. We depend on them for every conceivable purpose. We are familiar with every inch of their compact frames. But there is more to the smartphone than meets the eye. How are smartphones made? How have they shaped the way we socialise? And who tracks the movements they record? These are just some of the questions that journalist Elizabeth Woyke answers in an illuminating look at this feature of our day-to-day lives. Features interviews with key figures in industry.