Pick up a classic iPhone and you know where everything lives. Swipe up, glance at the Dynamic Island, pull down Control Centre, jump between apps. It all feels familiar before you think about it. Now imagine that same feeling on two very different devices: the iPhone 18 Pro, a refined flagship slab, and the iPhone Duo, a foldable with a compact outer screen and a larger 7.6-inch inner display. On paper, they shouldn’t feel the same. One is a polished evolution of the iPhone w