BlackBerry CEO Thorsten Heins has described the user interface of Apple's iOS as outdated, and has suggested that the iPhone could be at risk of being replaced if Apple doesn't speed up its innovation process.Related StoriesWeighing the iPad mini versus the Nexus 7 is no easy taskReactions and reflections: Should Apple be scared of Samsung's Galaxy S4?iPhone 6 rumours: Apple's new iPhone to have 'killer f
