【明報專訊】WHAT do you usually do on your phone? Just a little more than a decade ago, the main purpose of a mobile phone was still limited to making calls and sending messages. Now, thanks to technological advances, one can be playing games, shopping and even studying for an academic qualification from a reputable institution on a smartphone. The impact of the device is so huge that, as said in some popular YouTube ads, it can literally change one's life.