The iPhone Duo can lock the screen orientation of its two displays independently. Enabling Orientation Lock from Control Center applies only to the display you're using at the time, so the outer display can stay locked in portrait while the inner display is free to rotate as you open and reposition the phone.
Tim Hardwick is a Senior Editor at MacRumors. He specializes in covering a wide array of technology topics, including consumer electronics, mobile apps, and software, with a particular focus on Apple and big tech developments. Tim's insights and analysis have been featured in notable publications such as Infosecurity Magazine, WRAL TechWire, and Tech News Tube.