In just one decade, smartphones have spread at the speed of the flu virus all over the world. Today, more than half of the world's population uses a smartphone, and almost half of the world's internet traffic comes from these multi-functional, pocket-sized supercomputers. Smartphones had an enormous impact on society - today, we are far more connected than ever thanks to smartphones, and they are also to thank for the fast evolution of mobile broadband connections. Back when the first smartphone - the iPhone - was presented a decade ago, it was credited as being the "next big thing" by the ever-enthusiastic tech media, and indeed, its spread and growth was spectacular. Over the years, there were quite a few other products that received the same praise by the same media, yet they failed to achieve the widespread success of the smartphone - at this point, at least. Let's take a look at a few technologies that have been credited as being a significant innovation yet failed to achieve the mainstream status of the smartphone today.