Apple’s first foldable iPhone, expected under names like iPhone Duo or iPhone Ultra, reached a key milestone with its September 2026 announcement alongside the iPhone 18 Pro models. Supply-chain reports and iOS 27 code references confirm a book-style design featuring a roughly 5.5-inch cover display and 7.8-inch inner panel, advanced hinge engineering, Touch ID, and pricing above $2,000. Production targets have risen to around 10 million units for 2026 as Apple addresses manufacturing challenges seen in earlier prototypes. This positions the device against Samsung’s established Galaxy Z Fold lineup while signaling Apple’s intent to expand foldables into 2027 and 2028 models. Traders are watching for immediate shipping volumes and any last-minute delays in availability.