Apple has unveiled iPhone Duo, a foldable iPhone roughly the size of a passport when closed that opens to reveal the largest display Apple has put in an iPhone. This is the foldable iPhone we’ve been hearing about for so long. Duo opens to a 7.6-inch Super Retina XDR display with 50% more screen area than iPhone 18 Pro Max and 80% more than iPhone 18 Pro, according to Apple. Its 5.4-inch outer display offers 90% of the screen area of iPhone 18 Pro. Later this year, both screens will support Apple Pencil with USB-C for notes, sketches and document markups, bringing Apple Pencil support to iPhone for the first time.