Apple has taken the wraps off its long-rumored debut foldable phone: the iPhone Duo. This passport-style foldable introduces a new 1:1.4 display ratio for both the inner and outer displays, which iOS adapts to by moving key interface elements from the bottom of the display to the side. It also replaces FaceID with TouchID fingerprint security, and replaces Dynamic Island with a simple punch-hole camera on the outer display, and a camera hidden under the inner display. The inner display measures 7.6 inches while the outer display measures 5.4 inches. The inner display features a matte "nano-texture finish, and a multiple support layers to provide strength and reduce creases, including high-strength glass, titanium, and carbon fiber. Both displays will support an Apple Pencil stylus. The polished frame is made from grade 5 titanium. The back is made with Ceramic Shield, while Ceramic Shield 2 over the front display provides 3x better scratch resistance. The Duo features dual 48-megapixel cameras: main and wide-angle. The camera system has most of the features of the cameras on the new iPhone 18 Pro. The dual displays unlock several new camera modes, including viewfinders on both displays simultaneously, and Duo FaceTime so people on both sides can join a video call. The iPhone Duo has the same new A20 Pro chip that powers the new iPhone 18 Pro. It also uses Apple's new C2 chip for the cellular radio, which now supports mmWave 5G and 50% faster uploads (compared to the C1X). An Apple N1 chip enables Wi-Fi 7, Bluetooth 6, and Thread. The battery is capable of up to 31 hours of video playback on the inner display. It supports fast wired and wireless charging. iPhone Duo will be available in two colors: star white or night sky. Pre-orders begin October 16, with availability beginning October 23. Pricing starts at $1,999 with 256 GB of storage. It will also be available with 512 GB, 1 TB, or 2 TB.