Apple’s first foldable iPhone is designed to turn a phone-sized device into a more capable portable workspace. Called the iPhone Duo, it uses a book-style, wide folding design with a 5.4-inch outer Super Retina XDR display and a 7.6-inch internal Super Retina XDR display. The two panels share the same aspect ratio, which Apple says should make moving an app or video between them feel more consistent.
That larger screen is accompanied by a major iOS change: Split View is coming to iPhone for the first time with iOS 27. Duo owners will be able to run two apps side by side, swap their positions, or open two windows from the same app, such as two Safari pages. App pairs can be saved for later, while Siri AI can remain open in one half of the screen alongside another app. For a device that can approach small-tablet territory when opened, this is the feature most likely to define its day-to-day appeal.
A foldable screen built for bright outdoor use
Both screens support ProMotion, Always-On Display, and up to 3,000 nits of outdoor brightness. The internal panel adds a nano-texture finish intended to cut reflections and make the center crease less noticeable. Apple has also placed a FaceTime camera beneath the internal display, leaving it hidden when it is not in use.
The Duo uses a side-mounted Touch ID sensor rather than Face ID, a practical choice for a device that may be used folded or open. Its polished Grade 5 titanium chassis includes a hinge with more than 100 components, plus a magnetic closing system. Apple says the hinge supports the middle of the panel when the phone is open.
Durability measures include Ceramic Shield on the rear, Ceramic Shield 2 on the outer display, and IP68 water- and dust-resistance. Apple claims Ceramic Shield 2 is three times more scratch-resistant. The folding display has its own scratch-resistant layer, nano-textured polymer material, and a titanium support plate; specialized adhesives are intended to let display layers slide during folding and reduce mechanical stress. Color options are Star White and Night Sky.
Phone hardware with tablet-style connectivity
The iPhone Duo runs on Apple’s 2 nm A20 Pro chip, also used in the iPhone 18 Pro and iPhone 18 Pro Max. Apple specifies a six-core CPU it says is up to 20% faster than the A19 Pro, a seven-core GPU rated for up to 40% faster performance, and a dual 16-core Neural Engine said to double on-device AI processing power. Unified-memory bandwidth is also said to rise by 50%.
Storage configurations include 256GB, 512GB, 1TB, and 2TB. Apple is making the Duo eSIM-only globally, a decision it says frees internal room for the battery. Connectivity includes Apple’s N1 chip with Wi-Fi 7, Bluetooth 6, and Thread, plus the C2 modem. The C2 includes mmWave support in the United States.
- 5.4-inch outer and 7.6-inch folding Super Retina XDR displays
- Apple A20 Pro with six-core CPU and seven-core GPU
- 256GB, 512GB, 1TB, or 2TB storage
- Wi-Fi 7, Bluetooth 6, Thread, and U.S. mmWave support
- Up to 44 hours of video playback on the outer screen or up to 31 hours on the internal screen, according to Apple
Apple Pencil USB-C support is confirmed but will not be enabled until later in the year. That delayed addition could matter for users who see the large internal display as a compact note-taking or markup surface.
Cameras take advantage of the folding design
The rear camera system consists of a 48-megapixel Fusion main camera and a 48-megapixel Fusion Ultra Wide camera with macro support. The main camera can capture full-resolution 48-megapixel images or use 24-megapixel output by default, and it provides a 2x optical-quality zoom from its sensor. It also includes sensor-shift optical image stabilization.
The folding form factor enables Duo Preview, which places a live camera preview on the outer display for the subject to see. Users can also use the rear cameras for selfies with the outer screen serving as a viewfinder. Apple’s Smart Take uses on-device AI to assess a scene and automatically capture an image when subjects are ready.
For video, the main camera supports up to 4K at 120 fps in Dolby Vision. Cinematic Effects can be applied after recording at up to 60 fps, while Time-lapse can be recorded in 4K Dolby Vision HDR. The outer front camera supports Center Stage and can shoot photos and video in any orientation.
iOS 27 reshapes its interface around the Duo
When the Duo is unfolded, iOS 27 moves Lock Screen controls, the Dock, and in-app navigation toward the sides to preserve more vertical room. The Home Screen can show two pages at once, with Today View on the left, and the status area adopts a circular corner design. Dynamic Island is repositioned vertically along an edge on both displays, with support for Live Activities and notifications.
Apple says the interface responds in real time to folding angle, rotation, and transitions between screens. Netflix, Zoom, and Slack are said to already offer Duo-optimized versions, while new APIs are intended to help other developers adapt their apps. StandBy can operate on either display even when the phone is not charging, allowing the partly opened device to show a clock, photos, widgets, calendar information, or weather.
The company is also introducing a beta version of Siri AI with personal-context access across messages, email, and photos, awareness of on-screen content, and the ability to take actions based on it. Other Apple Intelligence features mentioned for the software include Spatial Reframing, Extend, an updated Clean Up tool, and photorealistic Image Playground output.
Pricing information in the available report is specifically attributed to an Apple Germany listing for the iPhone 18 Pro, rather than clearly identifying the iPhone Duo. That listing starts at €2,299 for 256GB, with 512GB, 1TB, and 2TB options listed at €2,549, €3,049, and €3,799, respectively. It cites September 12 for preorders and September 18 for deliveries. U.S. pricing, U.S. preorder details, and U.S. release timing for the iPhone Duo were not provided.
With its large inner display, side-by-side apps, and future Pencil support, the iPhone Duo appears aimed at people who want more productivity and flexibility than a conventional iPhone can offer without carrying a separate tablet. Its ultimate value proposition will depend on U.S. pricing and how broadly iOS 27’s foldable-focused software experience reaches third-party apps.
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