Apple announced its first foldable iPhone, dubbed the iPhone Duo, at the September 9, 2026 "Surprise and Shine" event alongside iPhone 18 Pro models. The book-style device features a 5.4-inch outer display and 7.6-inch inner screen, titanium build, near-invisible crease, A20 Pro chip, and starts at $1,999, with preorders opening October 16 and retail availability October 23. This official confirmation followed months of supply-chain reports confirming mass production and resolved engineering hurdles around the hinge and durability. The move positions Apple against Samsung, Huawei, and others in the growing foldable segment, where traders see strong implied probability of a 2026 launch given the locked timeline and no reported delays. Key near-term catalysts include actual shipping volumes and any last-minute supply adjustments.