tl;dr: Apple's iPhone Duo is the company's first foldable iPhone, featuring a 7.6" inner Super Retina XDR display with nano-texture finish and a 5.4" outer display sharing the same aspect ratio, powered by the A20 Pro chip with a dual-battery system delivering up to 31 hours of video playback. It includes a 48MP dual Fusion camera system with foldable-specific features like Smart Take, Duo Preview, and Duo FaceTime, uses Touch ID in the side button, and is eSIM-only. Available October 23, 2026, starting at 256GB with titanium construction and IP68 rating.