Director Steven Soderbergh has been pushing the limits of filmmaking in different ways lately. Be it independently releasing his last feature, working with HBO on its interactive Mosaic series, or, now, shooting a suspense movie entirely on an iPhone. How's Unsane look? Judging by the trailer below, it's promising. You won't mistake it for something shot on a RED camera anytime soon, and everything has a bit of a compressed aesthetic, but it works for the story of unraveling sanity and cyberstalking at hand.