"Given how quickly cellphones have taken over our lives, its easy to forget that they are still a relatively new technology. The first iPhone came out eight years ago, and today a little more than half the American population has a smartphone, according to eMarketer.
Yet already people spend close to three hours a day looking at a mobile screen and that excludes the time they spend actually talking on the phones."Source: Addicted to Your Phone? Theres Help for That - The New York Times