Canadian company Blackberry was once the leading smartphone maker in the world. However, within the space of several years, the launch of the iPhone in 2007 and then Android put paid to that. In what must be like a recurring nightmare for the company, Apple and Google are coming for them again in a market where they currently enjoy success.
There are still base features of BB10 that are not native on iOS or Android (I have the former for work and the latter for my personal). It probably sounds trivial, but I liked being able to have the phone automatically switch sound profiles bases on stuff in the calendar. Never had to remember to switch my phone to vibrate when going from the factory floor to a meeting.