its simple....they have been lacking good OS( operating system) for years....like apple have IOS...and it is powerful and have lots of application...like android...it is also powerfull and have lots of applications....nokia always have the best camera and other hardware...example see lumia 920...the best touch screen in the market...the strongest smartphone....but its windows phone...and still it lack applications...i really wish and waiting when nokia will start making android phones