Steven Soderbergh's ‘Unsane’ is a pulpy psychological thriller seen through an iPhone

Steven Soderbergh, who briefly retired from Hollywood after lamenting its timid small-mindedness, has shot his second post-hiatus film entirely on an iPhone.“Unsane,” a pulpy psychological thriller, is an exercise in genre and technology. It’s a B-movie iMovie. And it’s 98 minutes of proof that the laborious apparatus of filmmaking can be not only light on its feet, but fit snugly inside your pocket.Of course, not everyone has an “Unsane” on their smartphone.