Apple's new foldable iPhone Duo is the "thinnest iPhone ever" when unfolded at 5.2mm, 0.4mm thinner than the iPhone Air. However, when folded, it's 11.3mm thick, thicker than the iPhone 17 Pro Max and iPhone 18 Pro Max at 8.75mm. The iPhone Duo also weighs 254 grams, making it Apple's heaviest iPhone, 5 grams more than the iPhone 18 Pro Max.

It features a 7.6-inch inner display and a 5.4-inch outer display with a short, wide design. Pre-orders begin October 16, with launch on October 23.