Performance

The iPhone Duo uses Apple's next-generation A20 Pro chip, Apple's first mobile processor built on a 2nm manufacturing process. It includes a six-core CPU, a seven-core GPU and a dual sixteen-core Neural Engine.

The chip benefits from the custom vapour chamber and the advanced thermal management system that effectively dissipates heat during gaming, AI processing, and prolonged workloads.

Combined with Apple's software optimisation, the iPhone Duo is one of the fastest and most capable foldable devices on the market at the time of its release. 

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Battery 

Battery life remains one of the biggest challenges for foldable smartphones, particularly when powering large internal displays. The iPhone Duo has a dual battery system with a high-energy battery on each side of its folding body, with energy-rebalancing algorithms allowing the two batteries to operate as a single system.

The iPhone Duo offers up to 31 hours of video playback on the inner display, up to 44 hours on the outer display, and up to 24 hours of typical use when both screens are used equally. It's worth noting that the actual battery life will vary depending on settings, connectivity and how frequently the inner display is used.

MagSafe has also made the transition to Apple’s foldable design. The phone can charge to 50% in about 20 minutes with a compatible wired setup, or reach 50% in about 30 minutes with a MagSafe or Qi2 charger. Apple’s iPhone Duo Case and Folio with Kickstand are also compatible with MagSafe, Qi2 25W and Qi-certified charging.

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Touch ID

One of the most notable features of the iPhone Duo is the return of Touch ID, rather than Face ID. The fingerprint sensor is integrated into the side button, making it accessible whether the phone is open or closed.

This is a major move for Apple, marking the first iPhone model released with Touch ID since the third-generation iPhone SE in 2022. However, Touch ID has continued to feature on several iPad models during that time. This addition, paired with the unfolded form factor, creates a feel reminiscent of an iPad.

Apple Watch Unlock provides an additional authentication option if Touch ID is inconvenient. When enabled, a compatible, unlocked Apple Watch can securely unlock the iPhone Duo, extending a feature already familiar to users elsewhere in Apple’s ecosystem.

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Reimagined iOS experience 

The iPhone Duo embraces its foldable form factor by using a specially adapted version of iOS 27 across both displays. The operating system responds as the phone folds, changes orientation or switches between the inner and outer screens.

Siri AI

Siri AI can answer open-ended questions, brainstorm ideas and maintain natural back-and-forth conversation—all expressed through a customisable voice and pace. It can also use personal context to find relevant information across content such as messages, emails, notes and photos, as well as take actions within supported apps. For example, Call Context uses on-device intelligence to surface relevant information when users contact a business: if someone calls an airline, the Phone app can locate and display the relevant booking confirmation from Mail.

A dedicated Siri App brings all conversations together in one place. Conversations sync privately through iCloud, allowing users to ask a question on their iPhone and continue from where they left off on another compatible Apple device. Users can also pin useful conversations or begin a new one from within the app.

Siri mode in Camera combines Siri AI with Visual Intelligence. Users can tap the shutter button to let Siri see what the camera sees, then ask questions or request relevant actions based on the object or scene in front of them.

Write with Siri allows users to generate a draft from scratch simply by describing what they need. Siri can revise existing writing, provide feedback and automatically proofread text across the system, including in many third-party apps.

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Standby

StandBy has been expanded for the new design, and for the first time, it is available even when the phone is not charging. Propping up the iPhone Duo activates StandBy on either display, turning the device into a clock, photo frame or customisable widget hub.

In a standing position, it can show a bedside clock, photos, weather information, calendar details or favourite widgets. Exclusive Calendar and Weather faces join the available Clock and Modular views, while the Photos face can display Shared Albums.

Each StandBy face can be personalised with different colours and fonts. The outer display can also be placed at an adjustable angle for watching films and programmes, while the seated position provides controls on the lower half of the device for watching content or following a workout.


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Dynamic Island

The Dynamic Island has been redesigned to suit the iPhone Duo’s layout. It now sits vertically along the side of both displays and can expand to show Live Activities, alerts and other relevant information.

The status bar has been reworked into a flexible circular interface positioned in the corner of the screen. This displays information such as battery life, Wi-Fi connectivity and mobile signal without taking up unnecessary space across the top of the inner display.

The appearance and positioning of icons have also been revamped for the larger display.

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Camera system

The iPhone Duo features a 48MP Dual Fusion rear camera system comprising a Fusion Main camera and a Fusion Ultra Wide camera. While there is no separate telephoto lens, the Centre Stage camera provides an integrated optical-quality 2x Telephoto option and also supports ultra-stabilised video, helping footage remain smooth when recording handheld or whilst moving. The Ultra Wide camera also supports macro photography.

Camera features

The iPhone Duo's folding design introduces several new ways to take photos. Duo Preview displays a live camera feed on the outer screen, allowing the person being photographed to check their pose and framing. The outer display can also serve as a selfie viewfinder with the higher-resolution rear cameras.

Dual Capture can simultaneously record from the front and rear cameras, with support for up to 4K Dolby Vision at 30 frames per second. 

Smart Take uses on-device AI to detect when everyone is ready before automatically capturing a photo, while Smart focus tracking uses on-device intelligence to lock onto a subject and maintain focus as they move through the scene, even if they temporarily leave the frame and return. Meanwhile, Kid Cue displays animations on the outer screen to encourage children to look towards the camera. 

Customisable camera widgets provide fast access to manual controls, making frequently used settings easier to reach when the iPhone Duo is being used in different positions or as a hands-free camera.

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Duo FaceTime

Duo FaceTime uses the outer display to let nearby people join in on the video call without crowding around the main screen. This makes group calls easier without requiring users to pass the phone around or squeeze everyone into the view of one display. The phone can also support itself in a partially folded position for hands-free FaceTime calls.

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Creative features

Photographic Styles 3 adds texture and grain controls alongside adjustments for tone and colour. Users can use these options to smooth skin details or create a more stylised, film-like appearance while preserving the qualities of the original image.

Cinematic mode applies a depth-of-field effect that keeps the subject sharp while blurring the foreground and background. The effect can also be applied or adjusted after recording, giving users more control over the finished video rather than requiring every decision to be made while filming.

Apple Intelligence also introduces more advanced editing options. Spatial Reframing allows users to improve a photograph’s composition after it has been captured by shifting its perspective, with changes previewed in real time. The enhanced Clean Up tool can remove larger distractions and fill the space with more realistic-looking detail, including in complex scenes.

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