iPhone Duo

The iPhone Duo is Apple's first foldable device, featuring two displays instead of one. Apple introduced the iPhone Duo alongside the iPhone 18 Pro and iPhone 18 Pro Max on September 9.

Apple designed the iPhone Duo with a passport-style shape, and it is wider than it is tall when open. When closed, there's a 5.4-inch outer display, and it unfolds to a 7.6-inch inner display. At 7.6 inches, the inner display is the largest iPhone display to date, while the outer display is sized similarly to the now-discontinued 5.4-inch iPhone mini. Both displays have the same aspect ratio so content scales appropriately and it feels natural moving from the outer display to the larger inner display.

At 5.2mm thick when unfolded, the iPhone Duo is the thinnest iPhone yet, but it's also the heaviest iPhone at 254 grams. When folded, the Duo is 11.3mm thick.

Apple built the iPhone Duo for durability, and it has a mirror-polished grade 5 titanium frame and a 3D-printed hinge cover with a micro-blasted finish, along with internal support ribs and ceramic fiber antenna inserts for rigidity. The iPhone Duo has an IP68 dust and water resistance rating. It comes in Star White and Night Sky, which is a dark blue color.

The hinge has over 100 components for smooth opening and closing and to protect the display. It supports the display center when it's open, and there is a satisfying magnetic click when the device closes. The outer display is protected by Ceramic Shield 2, while the back is protected by standard Ceramic Shield. The inner display is made up of 10 ultrathin layers, including a nano-texture cover layer made from a stiff, custom polymer that reduces glare and helps hide the crease. Glass above and below the display panel add structure, and custom adhesives let all of the layers glide in a way that relieves bend stress and minimizes the crease in the middle of the device.

Both displays are OLED with support for 120Hz ProMotion, True Tone, Always-On, and up to 3,000 nits peak brightness outdoors. The 7.6-inch inner display has a resolution of 1878 x 2670 at 430 pixels per inch. The 5.4-inch display has a resolution of 1398 x 2034 at 460 pixels per inch. On the inside display, there's a hidden FaceTime camera that's under the display panel, and a 12MP hole-punch front-facing camera on the outer display.

The iPhone Duo looks like a cross between a small iPhone and an iPad mini. It has volume buttons on the top, but no Action button and no mute switch. The right side includes a Touch ID side button and a Camera Control button. Apple used Touch ID instead of Face ID, and there is no TrueDepth camera system. Touch ID works when the device is open or closed, and it is used for Apple Pay and other biometric features. Apple also allows the iPhone Duo to be unlocked with a connected Apple Watch.

The iPhone Duo uses the same 2nm A20 Pro chip as the iPhone 18 Pro. It has two super cores and four efficiency cores, and it is up to 20 percent faster than the A19 Pro. There's a 7-core GPU with Neural Accelerators that's up to 40 percent faster than the A19 Pro, plus a new dual 16-core Neural Engine and 50 percent more memory bandwidth. A new vapor chamber cooling system offers up to 35 percent better sustained performance than the iPhone 17 Pro. An updated display engine supports both screens at one time.

Apple is adding Apple Pencil support to the iPhone Duo before the end of 2026, but it will only work with the USB-C Apple Pencil.

At the back of the iPhone Duo, there's a camera plateau where Apple hid much of the hardware in the device. There's a 48MP Fusion Main wide camera with a 26mm focal length and a 12MP 2x optical-quality zoom option at 52mm. Apple also included a 48MP Ultra Wide camera with a 13mm focal length and support for macro images. There is no telephoto lens and no variable aperture, with those features limited to the iPhone 18 Pro models. The cameras support Apple's new Photographic Styles 3 feature with texture and grain, along with manual controls for adjusting white balance, exposure, and more.

As for video, the Fusion camera supports 4K120 Dolby Vision recording, Cinematic mode up to 4K60 with the option to apply effects after capture, 4K30 Dual Capture, and 4K Dolby Vision time-lapse which is useful on the iPhone Duo because you can prop it up for recording without the need for a tripod.

Apple added several camera features unique to the iPhone Duo. Smart Take uses on-device AI to detect when everyone is ready for a group shot, so you don't have to use a timer. Duo Preview lets the person you're taking a photo of see a preview of the shot on the outer display, so they can make adjustments. Kid Cue shows Peanuts animations to get children to look at the camera, and Duo FaceTime lets you use both the inner and outer cameras on FaceTime calls so multiple people can join in.

There are batteries inside each half of the Duo, though they're managed as one battery. The iPhone Duo battery lasts for up to 24 hours of typical use when switching between both displays. It supports up to 31 hours of video playback and 26 hours of streaming video on the inner display, and 44 hours of video playback and 37 hours of streaming video on the smaller outer display.

Fast charging is included, and the iPhone Duo can charge to 50 percent in 20 minutes over USB-C with a 60W or better power adapter. It supports 25W MagSafe and Qi2 wireless charging and can charge to 50 percent in around 30 minutes with a 35 or better power adapter. The iPhone Duo is equipped with an Apple-designed C2 modem, which supports both sub-6GHz 5G and mmWave 5G (U.S. only). It is eSIM only worldwide, like the iPhone Air. There's also an N1 networking chip with Wi-Fi 7, Bluetooth 6, and Thread. Like all modern iPhones, the iPhone Duo supports Crash Detection and multiple satellite features like Emergency SOS, Messages via satellite, and Find My via satellite.

The iPhone Duo will come with iOS 27.1 preinstalled, and Apple is making several changes to iOS to support the new dual-screen layout. The Dock is vertical instead of horizontal, and accessible from the side of the display. Apple also moved the status bar to the upper corner, and there's a vertical Dynamic Island on both displays. There are two Home Screen pages with a widget column on the inner display, and you can use two apps side by side or two windows of the same app in Split View.

Content on the iPhone Duo adapts to whatever orientation the device is in, rotating and flipping between displays. You can use either display in portrait or landscape mode, and there's support for using the Duo half-folded too. You can sit it upright with the inner display folded, or prop it up tent style and use the outer display.

Apple is adapting all of its apps for the Duo's screen, and developers have the tools to add Duo support to their apps. Apple worked with developers like Netflix, Zoom, and Slack to customize apps to the dual-screen layout ahead of time. There's a new Duo-specific StandBy mode that works even when it's not charging. You can see widgets like Calendar and Weather with the device propped up, and there's a special alarm clock option that wakes you up with a soft glow.

The iPhone Duo is priced starting at $1,999 for 256GB of storage. Pre-orders will start at 5:00 a.m. Pacific Time on Friday, October 16, and a launch will follow on Friday, October 23 in more than 70 countries. It will expand to an additional 28 countries on October 30.

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Apple plans to introduce a second-generation iPhone Duo in 2027. The 2027 version will fall on the 20th anniversary of the iPhone's launch.