At its September event today, Apple unveiled the iPhone Duo, its first foldable iPhone and one of the biggest changes to the device’s form factor since its debut. Starting at $1,999 and available for preorder beginning October 16th, the device is roughly the size of a passport when closed and pairs a 5.4-inch outer screen with a 7.6-inch Super Retina XDR inner display. Apple says the inner screen offers 50% more display area than the iPhone 18 Pro Max, while the exterior display provides about 90% of the screen area of an iPhone 18 Pro.