This was revealed in a report from IndieWire in which Soderbergh was asked about his movie “Unsane” which was shot entirely on an iPhone. He was asked if he could consider shooting exclusively with the device, in which he replied by saying that it’s something that he would think about.
He claims, “I’d have to have a pretty good reason not to be thinking about that first… There’s a philosophical obstacle a lot of people have about the size of the capture device. I don’t have that problem. I look at this as potentially one of the most liberating experiences that I’ve ever had as a filmmaker, and that I continue having. The gets that I felt moment to moment were so significant that this is, to me, a new chapter.”
Soderbergh has been known to experiment with various filming techniques and technologies in the past, and at one point in time was a huge advocate for the RED cameras, so it’s actually a rather stark contrast from going to such high-end cameras to a mobile device. That being said, Soderbergh is not the first director to shoot using an iPhone. Back in 2015 director Sean Baker shot his movie Tangerine using an iPhone 5s.