Apple iPhone Duo: Everything You Need to Know About the First Foldable iPhone

The wait is finally over. Apple has officially stepped into the foldable smartphone market with a device that combines its familiar premium design with a completely new form factor. Officially called the iPhone Duo, although it is often referred to as the Apple iPhone Fold, the device brings a unique design, high-end materials, powerful hardware, and several new features to the iPhone lineup.

If you’re thinking about buying a foldable iPhone this year, here’s everything you need to know before placing your pre-order.

A "Passport" Design with Nano-Texture Displays

Unlike traditional foldable phones with tall, narrow designs, the foldable iPhone features a shorter, wider, passport-style form that feels more natural to hold when closed.

• Outer Display: A 5.4-inch Super Retina XDR display protected by Ceramic Shield 2 glass.
• Inner Display: Opens up to a 7.6-inch main display with a 1:1.4 aspect ratio. It features an under-display FaceTime camera and a nano-texture surface designed to reduce reflections and make the crease less noticeable.

Both displays support ProMotion up to 120Hz for smoother scrolling and visuals, along with a peak outdoor brightness of 3,000 nits and HDR brightness of up to 1,600 nits.

The iPhone Duo features a Grade 5 titanium frame and an IP68 rating for dust and water resistance. At just 5.2mm thick when unfolded and 11.3mm when folded, it weighs 254 grams.

Dual Cameras Designed for a Foldable iPhone

The iPhone Duo features an advanced dual-camera system housed in a raised rear camera plateau.

• 48MP Main Fusion Camera: Features an f/1.6 aperture and a 2x sensor crop for capturing detailed photos with optical-quality zoom.
• 48MP Ultra-Wide Camera: Offers improved wide-angle photography, with camera capabilities aligned with the iPhone 18 Pro series.

The foldable design also introduces handy features that make taking photos and videos easier, especially when shooting hands-free.

• Duo Preview: Lets your subjects see a live preview of themselves on the outer display before you take the photo.
• Kid Cue: Displays fun animations on the outer screen to keep children engaged and smiling while you take their pictures.
• Video Recording: Supports 4K Dolby Vision recording at up to 120 fps, ProRes video and Spatial Video capture.

Side Touch ID, Camera Control and eSIM-Only Design

The iPhone Duo introduces a few changes that long-time iPhone users may notice right away.

• Side-Mounted Touch ID: Instead of Face ID, the iPhone Duo features a Touch ID sensor built into the power button, allowing you to unlock your phone quickly and securely with your fingerprint.
• Camera Control Button: While the customizable Action Button is not included, Apple has retained the touch-sensitive Camera Control button. It can be used to quickly launch the camera and control features such as depth and zoom through gestures.
• eSIM Only: The iPhone Duo is eSIM-only worldwide, helping Apple make better use of the internal space for the battery and other components.

A20 Pro Performance, C2 Modem and Apple Pencil Support

The iPhone Duo is powered by the 2nm A20 Pro chip, paired with a vapor chamber cooling system to help maintain performance during demanding tasks. Together, they deliver up to 35% better sustained performance than previous Pro chips. Apple's custom C2 cellular modem also brings fast, power-efficient 5G connectivity.

For added productivity, the iPhone Duo introduces Apple Pencil (USB-C) support to the iPhone lineup for the first time. A software update planned for later this year will enable users to sketch and take notes on both the inner and outer displays. However, the device does not support Apple Pencil Pro.

iOS 27 Multitasking and Battery Life

The iPhone Duo runs on iOS 27, bringing iPad-inspired multitasking features to the iPhone. Users can run apps side by side, customise the dock position, and make the most of the foldable design. The interface also adapts to the hinge angle, allowing the lower half of the display to function as a virtual keyboard when the phone is laid flat.

Battery Life and Charging

The iPhone Duo offers different battery runtimes depending on which display you're using.

• Outer Display: Up to 40–44 hours of playback.
• Inner Display: Up to 31 hours of playback.
• Fast Charging: Charge the battery to 50% in around 20 minutes. The device also supports 25W MagSafe wireless charging and USB-C data transfer speeds of up to 10Gbps.

Conculsion

The iPhone Duo marks a major change for the iPhone lineup, bringing Apple’s take on the foldable smartphone to the market. Its passport-style design, dual displays, A20 Pro performance, and foldable camera features give it a different appeal from traditional iPhone models.

The combination of a 7.6-inch inner display, 5.4-inch outer display, A20 Pro chip, and support for features such as ProRes, 4K Dolby Vision at 120 fps, Spatial Video, and Apple Pencil makes the iPhone Duo a compelling option for users looking for a more versatile iPhone experience.