TL;DR
- Folding iPhone: Apple’s announced iPhone Duo opens into a two-app workspace and starts at $1,999 in the U.S.
- Camera Preview: Its outer screen lets photographed subjects see their framing and lets owners take selfies with the rear cameras.
- Purchase Dates: Preorders begin October 16, with initial availability October 23.
- Camera Tradeoff: Cheaper iPhone 18 Pro models have a separate camera for distant subjects that Duo lacks.
Apple has unveiled iPhone Duo, its first foldable phone, giving iPhone users a larger workspace that can show two apps together and a screen their photo subjects can see. Announced September 9, the device starts at $1,999 in the U.S. Its hinge also lets it stand on its own for calls and pictures.
Preorders begin at 5 a.m. Pacific on October 16, with availability scheduled for October 23 in more than 70 countries and regions, including the U.S., UK, India and China. Another 28 follow October 30. The starting price buys 256GB of storage, and the phone will ship with iOS 27.1.
Two Apps Without Switching Between Them
The 7.6-inch inner display and 5.4-inch outer display serve different moments: the outside works while the phone is closed, while opening it provides room for side-by-side apps. Both sizes are measured diagonally. Both screens have matching proportions, which Apple says helps content fill either display as users open or close the phone.
On the iPhone Duo, two apps each occupy half the display, with no resizing option. Users can also open two instances of an app, such as two Safari pages, and save an app pair to reopen together. With Split View, Apple’s side-by-side app layout, users can open Photos beside Mail and drag a picture from the library into a message. A source image and its destination remain visible together, instead of requiring repeated switches between full-screen apps.
Partially folding the phone changes the layout again. The hinge supplies the support that a handheld phone would otherwise need from a stand, while software separates the viewing and touch areas. Apple also plans to add compatibility with its USB-C Apple Pencil stylus later in 2026.
A Camera Screen for the Person in the Picture
The outer display becomes useful to someone other than the owner through Duo Preview. A person being photographed can see the live shot and adjust their pose or framing. Turn the rear cameras toward yourself, and that same screen provides a viewfinder for a selfie.
For group pictures, the phone can stand without someone holding it. Apple’s Smart Take feature uses on-device AI to detect when people are posing and capture the picture automatically, letting the photographer join them. Duo FaceTime similarly lets nearby people join a video call through the outer display, rather than gathering around one screen.
These new ways to compose a picture come with a different camera selection from Apple’s Pro phones. Duo’s two rear cameras are a 48-megapixel main camera and a 48-megapixel ultrawide. The main camera also produces a tighter 12-megapixel view that Apple calls 2x optical-quality zoom. It has no separate telephoto lens.
The iPhone 18 Pro and Pro Max have a dedicated 4x telephoto camera, giving buyers separate hardware for photographing more distant subjects. Their 256GB models start at $1,199 and $1,299, respectively, with initial availability scheduled for September 18. The extra spending on Duo buys the folding screen and its different shooting positions, rather than the most extensive iPhone camera system.
Shorter Closed, but Thicker in a Pocket
Duo measures 117.8mm tall when closed, compared with 163.4mm for iPhone 18 Pro Max, but it is wider: 84.1mm against 78mm. Its closed thickness is 11.3mm, versus 8.75mm for Pro Max. Opened flat, Duo is 5.2mm thick. At 254 grams, it also weighs slightly more than the 249-gram Pro Max.
The fold itself remains visible. Apple says adhesives between the inner display’s layers let them glide as it folds, reducing stress and the crease. Long-term wear remains unknown.
Duo has a titanium frame and hinge cover, protective Ceramic Shield on the outside and a scratch-resistant coating inside. Its IP68 dust- and water-resistance rating demands controlled laboratory testing at up to six meters underwater for 30 minutes. Apple warns that resistance can decline with wear and that liquid damage is excluded from the warranty.
Screen choice also changes Apple’s battery estimates. The company rates video playback at up to 31 hours on the inner display and 44 hours on the outer one. Its separate claim of up to 24 hours of typical use comes from a mixed workload with equal use of both displays on preproduction phones.
Existing Foldables Show Why Apps Matter
Samsung already sells a close-sized alternative. The Galaxy Z Fold8 also has a 7.6-inch inner screen, weighs 201 grams and supports two- or three-app layouts with selected applications. Its U.S. starting price is $1,899.99 before promotional discounts or trade-ins. Compared with Duo, it pairs the same advertised inner diagonal with substantially less weight.
Samsung’s larger Galaxy Z Fold8 Ultra includes a separate 3x optical telephoto camera. That offers another combination of folding display and zoom hardware for buyers who value both.
Apps use the available space differently. On the Galaxy Z Fold8, Spotify can show playlists alongside its playback window, while Slack can stay small to merely stretch conversations across the wider display. The first arrangement gives separate tasks their own space; the second mostly enlarges an existing phone layout.
Apple’s Photos-to-Mail example and its launch demonstrations show how Duo can use that space. How broadly third-party apps will offer similarly useful layouts at the October launch remains open.
