Whenever a company is looking to design and push out a new version or an entirely new model smartphone or tablet, it stands to reason that they are looking to implement the next big design feature or piece of functionality that will set their product apart from the competition. When Apple released the iPhone 4S at the back end of last year, they genuinely believed that the voice controlled Siri assistant would separate their product from the rest, a sentiment that Samsung and Google have subsequently bought into.