Apple iPhone Duo Review Details 5.2mm Unfolded Profile and Nano-Texture Inner Display

Early hands-on testing of Apple's first foldable smartphone, the iPhone Duo, details a notebook-style Grade 5 titanium device weighing 254 grams—five grams heavier than the iPhone 18 Pro Max—following earlier reports that Apple retail staff were told to warn walk-in buyers about supply. When folded, the IP68-rated device measures 11.3mm thick (about 29% thicker than the iPhone 18 Pro and Pro Max), 117.8mm tall, and 84.1mm wide, unfolding via a variable-torque hinge with more than 100 individual components to 5.2mm thin—thinner than the 5.64mm iPhone Air. Both the 5.4-inch outer display and 7.6-inch inner display share a 1.4:1 aspect ratio, giving the outer screen 90% of the screen area of the iPhone 18 Pro, though its squat proportions and right-aligned software controls reduce usable space in Safari and make one-handed reach harder for left-handed users. The 7.6-inch inner OLED panel is constructed from more than 10 ultra-thin sliding layers backed by a titanium plate and topped with a replaceable nano-textured polymer layer that Apple says is up to 40% stiffer than competing materials, diffusing reflected light to hide the crease during head-on use.