? Unsane

A young woman is involuntarily committed to a mental institution, where she is confronted by her greatest fear--but is it real or a product of her delusion? Filmed entirely on an iPhone. Starring Claire Foy, directed by Steven Soderbergh.

http://www.firstshowing.net/2018/first-trailer-for-steven-soderberghs-film-unsane-filmed-on-an-iphone/