People are becoming more and more dependent on communications networks for both business and personal use. In only 10 years since the launch of the first iPhone, and starting from October 20161, Internet usage by mobile and tablet devices has exceeded desktop usage worldwide. This year, the global smartphone installed base reached 2.8 billion (it was less than half a billion in 2009). Nowadays, the smartphone is a more capable and sophisticated platform than any previous-generation PC and is equivalent to a pocket supercomputer.