Apple announced its first foldable iPhone, the book-style iPhone Duo with a 5.4-inch outer display and 7.6-inch inner screen, on September 9, 2026, alongside the iPhone 18 Pro series. The device uses an A20 Pro chip, titanium frame, nearly crease-free flexible OLED, Touch ID in the side button, and iOS 27 optimizations for multitasking and productivity. Preorders opened October 16 with shipments beginning October 23 at a $1,999 starting price, matching premium competitors like Samsung’s Galaxy Z Fold models while emphasizing thinner design and consistent aspect ratios. Strong early demand has already pushed delivery estimates into early 2027 amid reported supply constraints, mirroring past limited launches. Traders monitoring the market should watch for any last-minute production or regulatory shifts before the imminent availability window.