Apple kept the iPhone Duo's announcement focused on the big picture: its first foldable, a 7.6-inch inner display, and a $1,999 starting price. Since then, Apple's product page has filled in most of the spec sheet. This page walks through every specification Apple has confirmed, explains what each one means in plain terms, and clearly marks the few details that are still unconfirmed.
Key takeaways
- Displays: 7.6-inch inner display and 5.4-inch cover display, both with ProMotion and 3000 nits peak outdoor brightness.
- Build: grade 5 titanium body in Star White or Night Sky, rated IP68 for water and dust resistance.
- Chip: Apple A20 Pro, paired with the Apple C2 modem.
- Cameras: 48MP Dual Fusion rear system, 12MP Center Stage front camera, and an under-display FaceTime camera.
- Software: ships with iOS 27.1, with Split View for two apps side by side.
- Stylus: Apple Pencil with USB-C support later this year, on either display.
- Still unconfirmed: battery capacity, weight and dimensions, repair pricing, the Pencil support date, and 512GB and 1TB prices.
Display
The headline spec is the 7.6-inch inner display, the screen you get when the Duo is unfolded. That puts it squarely in small-tablet territory and in the same class as Samsung's Galaxy Z Fold 8, which we cover in our iPhone Duo vs Galaxy Z Fold 8 comparison. The inner display has a nano-texture finish that reduces glare and reflections, which Apple says also minimizes how visible the crease is.
When the phone is folded shut, you use the 5.4-inch cover display. That number matters more than it sounds: the cover screen is the display you will use most often for quick tasks, and its size defines how the Duo feels as a daily phone. Both displays support ProMotion for smooth scrolling, Always On, and up to 3000 nits of peak outdoor brightness, so neither screen is a compromise in daylight.
Design and build: titanium
Apple confirmed a grade 5 titanium body for the iPhone Duo, offered in two finishes: Star White and Night Sky. Titanium has been Apple's premium material of choice for recent Pro iPhones, and it makes particular sense on a foldable, where keeping weight down matters more than usual. A foldable is essentially two halves of a phone joined by a hinge, and every gram counts when the device lives in your pocket folded shut.
The Duo is rated IP68 for water and dust resistance, a meaningful confirmation for a device with a hinge and a folding display. Apple has not confirmed the Duo's weight or thickness, folded or unfolded. Those numbers will matter a lot for real-world comfort.
Performance: the A20 Pro chip
The iPhone Duo runs on the A20 Pro chip, Apple's latest Pro-class silicon. Apple has not published clock speeds, core counts, or benchmark figures, but the Duo is not getting a cut-down chip. For a foldable, that matters: the unfolded 7.6-inch display invites serious multitasking, with multiple apps on screen at once, and that workload leans heavily on the processor and memory.
What we do not know yet is how much RAM the Duo ships with, which affects how many apps it can keep alive in the background during split-screen multitasking. Apple never advertises RAM figures, so this one may only be confirmed by teardowns after launch.
Cameras
The Duo uses a 48MP Dual Fusion camera system on the back: a 48MP Fusion Main camera and a 48MP Fusion Ultra Wide camera. On the front, a 12MP Center Stage camera handles selfies and video calls when the phone is folded, and an under-display FaceTime camera sits beneath the inner display for calls when it is open. Camera specs on paper only go so far, so expect a clearer verdict once reviewers compare real photos against the iPhone 18 Pro Max and rival foldables.
Connectivity: Apple C2 modem
The Duo includes the Apple C2 modem, the company's second-generation in-house cellular modem. This is notable because it means the iPhone Duo is fully on Apple silicon for both processing and connectivity, continuing Apple's move away from third-party modem suppliers. Apple has not published modem specs such as peak download speeds or carrier aggregation details, so real-world 5G performance is still untested.
Software: iOS 27
The iPhone Duo ships with iOS 27.1, and Apple has confirmed Split View: two apps side by side on iPhone for the first time, plus two windows of the same app. The key software challenge for any foldable is continuity: apps need to move smoothly between the cover display and the inner display, and the unfolded screen needs multitasking layouts that make the extra space useful rather than merely bigger. Split View covers the most important part of that, and the rest of the picture will be clear once reviewers spend time with the shipping software. Our guide to iOS 27 on the iPhone Duo covers what to expect.
Apple Pencil support
Apple has confirmed that the iPhone Duo will support Apple Pencil with USB-C later this year, for notes, sketching, and marking up documents on either display. The exact date is still unconfirmed. For note-takers and artists, this is a meaningful caveat: if stylus input is a reason you are considering the Duo, you will be buying the hardware ahead of the feature, with Pencil support arriving in a later update.
Still unconfirmed
Most of the spec sheet is now official. Here is what Apple has not confirmed yet:
- Battery: no capacity or rated battery life announced.
- Weight and dimensions: unconfirmed.
- Repair pricing: no figures for screen or hinge repairs.
- Apple Pencil: exact date for Apple Pencil with USB-C support unconfirmed.
- 512GB, 1TB, and 2TB prices: Apple has announced only the $1,999 starting price (256GB). MacRumors reports $2,199, $2,599, and $3,199, but those are not Apple-confirmed.
- Carrier pricing and trade-in values: unconfirmed.
We will update this page as Apple confirms each detail. For pricing and release dates, see our iPhone Duo price, release date and specs guide.
Frequently asked questions
What is the iPhone Duo screen size?
Apple has confirmed a 7.6-inch inner display for the unfolded iPhone Duo and a 5.4-inch cover display for when it is folded. Both support ProMotion and reach 3000 nits of peak outdoor brightness.
What chip powers the iPhone Duo?
The iPhone Duo runs on the Apple A20 Pro chip. Apple has not shared clock speeds or core counts, but the A20 Pro is the company's latest Pro-class silicon, so the Duo is not getting a cut-down chip.
What is the Apple C2 modem?
The C2 is Apple's second-generation in-house cellular modem, handling 5G connectivity in the iPhone Duo. Apple has not published detailed specs like peak download speeds, so real-world performance remains to be tested.
What iOS version does the iPhone Duo ship with?
The iPhone Duo ships with iOS 27.1, including Split View, which Apple confirmed lets you open two apps side by side on iPhone for the first time.
Which iPhone Duo specs are still unconfirmed?
Apple has now confirmed the cameras, the 5.4-inch cover display, the IP68 rating, and the Star White and Night Sky finishes. Still unconfirmed: battery capacity, weight and dimensions, repair pricing, the exact Apple Pencil support date, and prices for the 512GB and 1TB models.
Sources
- Apple September 9, 2026 keynote announcement (confirmed specifications)
- Apple, iPhone Duo product and tech specs pages, apple.com (A20 Pro, displays, cameras, IP68, finishes)
- iPhone Duo price, release date and specs guide (this site)
- Hero image: photo by 茅野ふたば via Wikimedia Commons, licensed under CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/).