iPhone Duo Dimensions & Specs: Folded, Unfolded, Weight
iPhone Duo dimensions: 117.8 x 84.1 x 11.3 mm (4.64 x 3.31 x 0.44 in) folded, 5.2 mm open, 254 g (8.96 oz). Plus how thick it gets in a case.
Editorial
Short answer
iPhone Duo dimensions: folded, the iPhone Duo measures 117.8 × 84.1 × 11.3 mm (height × width × depth), or 4.64 × 3.31 × 0.44 in. Unfolded it measures 117.8 × 164.6 × 5.2 mm (4.64 × 6.48 × 0.20 in). It weighs 254 g (8.96 oz) and has a 5.4-inch cover display and a 7.6-inch inner display.
| Measurement | iPhone Duo |
|---|---|
| Folded (H × W × D) |
117.8 × 84.1 × 11.3 mm 4.64 × 3.31 × 0.44 in |
| Unfolded (H × W × D) | 117.8 × 164.6 × 5.2 mm 4.64 × 6.48 × 0.20 in |
| Weight | 254 g (8.96 oz) |
| Cover display | 5.4 inches |
| Inner display | 7.6 inches |
Apple announced the iPhone Duo on 9 September 2026. Pre-orders open 16 October and it goes on sale 23 October, from US$1,999 or A$3,499. Pre-order times by city → Shopping for a case? Start with our picks of the best iPhone Duo cases, or browse the iPhone Duo collection.
Everyone is writing about the 5.2 mm. We design foldable cases, so we went looking at the other number.
By Priya Nair · FoldifyCase foldable case design team · 10 September 2026 · Updated 18 October 2026
iPhone Duo dimensions (folded and unfolded)
Folded, the iPhone Duo is 117.8 mm tall, 84.1 mm wide and 11.3 mm thick. Unfolded, it is 117.8 mm tall, 164.6 mm wide and 5.2 mm thick. The height stays the same because the Duo opens like a book along its long edge. Opening it nearly doubles the width and cuts the thickness to less than half.
Closed, you use the 5.4-inch cover display. Open, you get the 7.6-inch inner display, which has no camera cutout. All the iPhone Duo dimensions on this page are Apple's published figures, and we will check them with calipers on a retail unit after 23 October.
iPhone Duo dimensions in inches and centimetres
In inches, the iPhone Duo is 4.64 × 3.31 × 0.44 in folded and 4.64 × 6.48 × 0.20 in unfolded, and it weighs 8.96 oz. In centimetres it is 11.78 × 8.41 × 1.13 cm folded and 11.78 × 16.46 × 0.52 cm unfolded. With a slim case on, expect it to be about 0.52 in (13.3 mm) thick when closed.
How wide is the iPhone Duo?
The iPhone Duo is 84.1 mm wide folded and 164.6 mm wide unfolded. Folded, that is 2.2 mm wider than Samsung's wide Galaxy Z Fold 8 (81.9 mm) while being 6.1 mm shorter, so in the hand it feels closer to a passport than a phone. For how that compares with Apple's biggest slab, see iPhone Duo vs iPhone 18 Pro Max: closed, the Duo is 45.6 mm shorter and 2.55 mm thicker.
How thick is the iPhone Duo?
The iPhone Duo is 11.3 mm thick folded and 5.2 mm thick unfolded.
Apple's line is that the iPhone Duo is the thinnest iPhone ever made, at 5.2 mm. That is true, and it is a genuine engineering achievement. Unfolded, it is thinner than the iPhone Air.
It is also, closed, the thickest folding phone in its class.
| Closed thickness | |
|---|---|
| Galaxy Z Fold 8 Ultra | 8.9 mm |
| Galaxy Z Fold 8 | 9.7 mm |
| iPhone Duo | 11.3 mm |
A foldable spends most of its life closed, in a pocket. The number you actually live with is 11.3 mm — 2.4 mm more than the Z Fold 8 Ultra, which is a lot when you are talking about something you sit down with.
And here is the part that is our problem rather than Apple's: a case only ever adds to the closed number. A two-piece foldable case puts material on both outer faces. At a 1 mm wall per half (slim, not rugged), you are looking at roughly 13.3 mm in the pocket. Rugged designs will push past 15 mm.
iPhone Duo weight
The iPhone Duo weighs 254 g. That is the figure that made us sit up.
| Device | Weight | vs iPhone Duo |
|---|---|---|
| Galaxy Z Fold 8 | 201 g | −53 g |
| Galaxy Z Fold 8 Ultra | 215 g | −39 g |
| iPhone Duo | 254 g | — |
Titanium is strong, but it is not light. Grade 5 titanium in both the frame and the hinge is what gives the Duo its rigidity, and 53 g more than the Z Fold 8.
Add a case and you are carrying something close to 300 g. That is a real consideration, and it shapes what we would build: on this device, every gram of case has to justify itself. Chunky rugged designs that work fine on a 200 g phone become genuinely unpleasant here.
iPhone Duo full specs
The iPhone Duo has a 7.6-inch inner display and a 5.4-inch cover display, Apple's A20 Pro chip, two 48MP rear cameras, IP68 water and dust resistance, Touch ID in the side button and 25W MagSafe, all in a 254 g titanium frame. Here is the full confirmed spec sheet.
| Folded | 117.8 × 84.1 × 11.3 mm |
| Unfolded | 117.8 × 164.6 × 5.2 mm |
| Weight | 254 g |
| Inner display | 7.6in LTPO Super Retina XDR OLED, 1878 × 2670, 120Hz, 3000 nits peak, Nano Texture finish |
| Cover display | 5.4in, 1398 × 2034, 460 ppi, Ceramic Shield 2 |
| Build | Grade 5 titanium frame and hinge, Ceramic Shield 2 front, Ceramic Shield back |
| Water/dust | IP68: dust tight, immersible to 6 m for 30 min |
| Chipset | Apple A20 Pro (2 nm), 12GB RAM, ships with iOS 27.1. Vapour-chamber cooling, dual-battery architecture |
| Rear cameras | 48MP Fusion Main f/1.6 with sensor-shift OIS + 48MP Fusion Ultra Wide f/2.2. No dedicated telephoto lens; the 2× is a crop from the main sensor |
| Front cameras | Under-display camera on the inner panel (no cutout), 12MP Center Stage on the cover |
| Biometrics | Touch ID in the side button |
| Charging | Wired PD3.2, 50% in 20 min · 25W MagSafe / Qi2, 50% in 30 min |
| SIM | eSIM only — no tray |
| Apple Pencil | Apple Pencil (USB-C) only, on both displays, arriving later in 2026. Not the Pencil Pro |
| Colours | Night Sky, Star White |
| Price | From US$1,999 (256GB) to US$3,199 (2TB) · A$3,499 to A$5,899 |
The spec nobody is leading with, and probably should be
IP68. Dust tight.
Every Samsung book-style foldable to date, including the Z Fold 8 Ultra, is rated IP48. The 4 means it resists solid objects larger than 1 mm, but it does not keep out fine dust. The iPhone Duo is rated IP68: fully dust tight, and immersible to 6 metres.
If you have followed foldables for any length of time, you will know why this matters. Dust in the hinge has been the defining failure mode of the category. Grit works its way into the mechanism, then into the fold of the inner panel, and the damage is expensive and usually terminal. Samsung has been chipping away at it for years and has not closed the gap.
Apple appears to have made real progress on the first try. If that rating holds up in real-world use (we will be watching teardowns closely), it is the most significant thing about this device, and it barely got a mention on stage.
One correction to how we first read this. An ingress rating describes what reaches the electronics, not what collects in the mechanism. Teardowns of other foldables have found hinges packed with grit despite brushes and sealing tape. So IP68 is excellent news for the internals, but it does not take the hinge off the list of things a case should look after. We go through the evidence in our hinge durability breakdown.
The other thing Samsung gave up and Apple did not
Look closely at the inner display above. There is no punch-hole, no notch, nothing. The selfie camera sits under the panel.
Samsung shipped under-display cameras on the Z Fold 3 through 6, then removed the feature on the Z Fold 7. Apple has arrived with one working on its first attempt. It is a lower-specification camera than the 12MP Center Stage unit on the cover display (Apple lists f/1.8 and 1080p video), so you will want the outer camera when the shot matters. But the uninterrupted inner panel is real, and it is the detail that gives the device away in photographs.
It is also, incidentally, how you can spot imagery made before the launch. Every pre-announcement render we have seen drew a punch-hole in the corner of the inner screen. If a listing is using one of those pictures, it was made by someone who had not seen the phone.
What Apple left out
Two absences worth naming at US$1,999.
No dedicated telephoto lens. Two 48MP cameras: a Fusion Main and a Fusion Ultra Wide. Apple markets an "optical-quality 2× Telephoto", but that is a crop from the main sensor rather than a third lens. The Galaxy Z Fold 8 Ultra has a 200MP main, a 50MP ultrawide and a genuine 10MP 3× telephoto for US$2,099. If you photograph anything at distance, that is a real gap.
No Face ID. Touch ID lives in the side button instead. We wrote about why that rules out an entire category of case design before the announcement, and the confirmation makes it concrete: any case that covers the power button will break the unlock. Capacitive sensors need bare skin. If you are shopping rugged, check for an open, chamfered cutout at that button before anything else.
iPhone Duo vs Galaxy Z Fold 8 dimensions: why no Samsung case fits
No Galaxy Z Fold case fits the iPhone Duo, because its folded footprint differs in every direction. It is closest to Samsung's wide Galaxy Z Fold 8 rather than the tall Ultra.
| Folded | Height | Width | Thickness |
|---|---|---|---|
| iPhone Duo | 117.8 mm | 84.1 mm | 11.3 mm |
| Galaxy Z Fold 8 | 123.9 mm | 81.9 mm | 9.7 mm |
| Galaxy Z Fold 8 Ultra | 158.4 mm | 72.8 mm | 8.9 mm |
Against the Z Fold 8 it is 6.1 mm shorter, 2.2 mm wider and 1.6 mm thicker. In a photograph those two devices look like siblings. In a case mould they are unrelated.
To put that in perspective: a camera cutout machined 0.3 mm off centre will vignette an ultrawide shot. We are talking about differences five to twenty times that size, in all three axes at once. There is no adaptation, no stretch, no "close enough". The Duo needs tooling cut for the Duo.
Apple is selling its own cases from day one
Apple announced its own iPhone Duo Case (navy blue or sand) and iPhone Duo Folio with Kickstand (navy blue or taupe) alongside the phone. That is worth knowing for two reasons.
The first is practical: on day one, Apple's is the only case guaranteed to have been designed against the real hardware. If you want protection on 23 October and nothing else, that is the honest answer, and we would rather tell you that than sell you something we have not measured.
The second is what it tells you about the device. Apple building a two-piece case for a foldable at all is a signal about how much the closed thickness and the coated inner panel constrain the design — the same constraints we set out below, arrived at independently.
What we would design for this device
Reading the spec sheet as a brief, four things stand out.
- Thin walls, aggressive corners. At 11.3 mm and 254 g, bulk is the enemy. Put the material where drops actually land (corners and the hinge edge) and take it off everywhere else.
- An open, chamfered power-button cutout. Non-negotiable with side-button Touch ID.
- Nothing touching the inner panel. The Nano Texture finish is a coated surface, and coated surfaces mark. Raised bezels, zero contact when closed.
- Magnet transparency, not magnet addition. The Duo has 25W MagSafe built in. Unlike our Samsung cases, which add a magnet array, a Duo case has to get out of the way of one and keep it aligned.
One bonus: eSIM only means no SIM tray, which is one less cutout to get wrong and slightly more structural continuity along the bottom rail. Small mercy, genuinely useful.
When you can actually buy a third-party case
Pre-orders for the phone open 16 October and it ships 23 October. Third-party cases that genuinely fit come after that, not before — because confirming the fit requires a retail unit on a bench with calipers on it.
iPhone Duo cases have been listed online since the day of the announcement (ours included), and none of them has been checked against a retail unit, because nobody outside Apple has one yet. Any listing still using the "iPhone Fold" name, or photos with a camera hole in the inner screen, was designed from pre-announcement leaks rather than the real phone. We set out how to read those listings in why a case that truly fits comes after launch, and you can see every case we make for the phone in our iPhone Duo collection. For what to check before you buy any of them, see our best iPhone Duo (iPhone Fold) cases (2026) guide.
Pre-order · dispatched after we measure
That includes ours, so here is where we stand
Two of the cases we make for the iPhone Duo are below. Having just spent an article telling you to distrust anything cut before launch, we are not going to pretend ours are an exception: these moulds were cut to Apple's published dimensions, not from a measured retail unit. Nobody outside Apple has a retail unit until 23 October.
The difference is what happens on that date. We are buying a Duo and putting calipers on it, and pre-orders are not dispatched until the fit is confirmed against that unit. If the tooling is out, we recut it rather than ship you a case that does not fit. That is the whole reason to reserve with us instead of buying the first listing you find.
Kinetic P1
Full hinge cover, open side button for Touch ID, and a spine slot for a slim stylus — not a full-length Apple Pencil, which is longer than the phone. Three colours.
A$129.00
Reserve the Kinetic P1
Axon M1
Clear shell with a rotating ring grip and kickstand — useful on a 254 g phone. Six accent colours.
A$129.00
Reserve the Axon M1Product photography shows the Galaxy Z Fold versions. The iPhone Duo version of each case is a separate mould. Dispatch expected from late October once fit is verified against a retail unit; 30-day returns apply.
Measured, not guessed
Not ready to commit? Get the measurements first
We are buying a Duo on 23 October. Calipers, teardown photos, and an honest answer on what fits — published the week we get it. One email, no spam, no renders.
So — is it any good?
We design cases, not phone reviews, so take this as a structural read rather than a verdict.
Apple has done the hard part properly. IP68 on a book-style foldable is a first, and it addresses the failure mode that has quietly killed more foldables than drops ever have. The titanium hinge, the Ceramic Shield 2 cover glass and the claimed small crease all point the same way: this is built to survive being a foldable, which is not something we could say about the first generation from anyone else.
What Apple traded for it is weight and closed thickness. 254 g and 11.3 mm is the cost of that titanium and that ingress sealing. Whether that trade is right for you depends entirely on whether you have ever had grit in a hinge.
And at US$1,999 with no dedicated telephoto, the camera system is the weakest part of the sheet. The Z Fold 8 Ultra costs US$100 more and gives you a 200MP main and a true 3× telephoto.
Frequently asked questions
What are the dimensions of the iPhone Duo?
Folded, the iPhone Duo measures 117.8 × 84.1 × 11.3 mm (height × width × depth), or 4.64 × 3.31 × 0.44 in. Unfolded, it measures 117.8 × 164.6 × 5.2 mm (4.64 × 6.48 × 0.20 in), and it weighs 254 g (8.96 oz). At 5.2 mm open it is Apple's thinnest iPhone, while at 11.3 mm closed it is thicker than any current Samsung book-style foldable.
What is the size of the iPhone Duo's cover display when folded?
5.4 inches. When the iPhone Duo is folded you use the 5.4-inch cover display, which runs at 1398 × 2034 pixels (460 ppi) behind Ceramic Shield 2. Open the phone and you get the 7.6-inch inner display, a 1878 × 2670 LTPO OLED panel with a Nano Texture finish and no camera cutout.
How wide is the iPhone Duo?
84.1 mm wide when folded and 164.6 mm wide when unfolded. Folded, it is 2.2 mm wider than Samsung's wide Galaxy Z Fold 8 but 6.1 mm shorter, at 117.8 mm tall. That short, wide shape is why cases and MagSafe accessories made for taller phones do not sit the same way on it.
How thick is the iPhone Duo?
11.3 mm when folded and 5.2 mm when unfolded. The unfolded figure makes it Apple's thinnest iPhone, but folded it is 2.4 mm thicker than the Galaxy Z Fold 8 Ultra and 1.6 mm thicker than the Galaxy Z Fold 8. A slim case with 1 mm walls takes it to about 13.3 mm.
How much does the iPhone Duo weigh?
254 g. That is 53 g more than the Galaxy Z Fold 8 (201 g) and 39 g more than the Galaxy Z Fold 8 Ultra (215 g). Apple uses grade 5 titanium for the frame and hinge, which is strong but not light. Add a case and you are carrying close to 300 g.
Is the iPhone Duo waterproof?
It is highly water resistant rather than waterproof. The iPhone Duo is rated IP68: fully dust tight and immersible to 6 metres for up to 30 minutes. That is notably better than the IP48 rating on Samsung's Galaxy Z Fold 8 and Z Fold 8 Ultra, which resist objects larger than 1 mm but are not dust tight.
Does the iPhone Duo have Face ID?
No. It uses Touch ID built into the side button instead. That means a case must leave the button open, because a covered power button stops the fingerprint sensor from reading. It is the first thing to check on any iPhone Duo case, and it rules out rugged designs that seal every button.
Does the iPhone Duo have a telephoto camera?
Not a dedicated one. It has a 48MP Fusion Main and a 48MP Fusion Ultra Wide. Apple's "2× Telephoto" is an optical-quality crop from the main sensor rather than a third lens. The Galaxy Z Fold 8 Ultra does have a separate 3× telephoto.
Does the iPhone Duo have a camera hole in the inner screen?
No. The inner 7.6in display uses an under-display camera, so there is no punch-hole or notch. The 5.4in cover display has a conventional 12MP Center Stage camera. Any image showing a cutout in the inner panel was made before the announcement.
Does the iPhone Duo support Apple Pencil?
Yes, but only the Apple Pencil (USB-C), on both displays, with support arriving later in 2026 rather than at launch. The Apple Pencil Pro is not supported. At 155 mm, the Pencil is longer than the 117.8 mm folded phone, so no case can store it along the spine.
Will a Galaxy Z Fold case fit the iPhone Duo?
No. The Duo folds to 117.8 × 84.1 × 11.3 mm, the Galaxy Z Fold 8 to 123.9 × 81.9 × 9.7 mm and the Z Fold 8 Ultra to 158.4 × 72.8 × 8.9 mm. All three differ in every axis, and camera and button positions differ too. Each needs its own tooling.
Does Apple make its own iPhone Duo case?
Yes. Apple announced an iPhone Duo Case (navy blue or sand) and an iPhone Duo Folio with Kickstand (navy blue or taupe) alongside the device. On launch day these are the only cases designed against the real hardware rather than from published dimensions. They cost US$79 and US$129 in the US, and A$119 and A$199 in Australia.
Can I pre-order a FoldifyCase iPhone Duo case?
Yes. The Kinetic P1 and Axon M1 shown above, plus the Spineguard P1 and Axon M2, each come in an iPhone Duo version made in a separate mould cut to Apple's published dimensions. iPhone Duo orders ship once we have confirmed the fit on a retail unit, expected from late October.
When will third-party iPhone Duo cases be available?
Cases can be cut to Apple's published dimensions now, but a genuine fit can only be confirmed on a shipping device, so expect confirmed-fit cases after the 23 October release rather than before. Cases listed before then, ours included, have not yet been checked against a retail unit.
Related guides
- Best iPhone Duo (iPhone Fold) cases (2026)
- iPhone Fold or iPhone Ultra? Why it launched as the iPhone Duo
- iPhone Duo pre-order guide: start time in your city and every price
- The hinge number Apple did not publish
- Touch ID and what it rules out for case design
- Why a case that truly fits the iPhone Duo comes after launch
- iPhone Duo vs iPhone 18 Pro Max: size, price and cases
- Galaxy Z Fold 8 and Z Fold 8 Ultra: confirmed specs
- Shop iPhone Duo cases
Sources
- Apple Newsroom — Apple unveils iPhone Duo (product images used above)
- GSMArena — Apple iPhone Duo full specifications
- Engadget — Apple announces the iPhone Duo
- TechCrunch — Apple unveils its first foldable, the iPhone Duo
- MacRumors — iPhone Duo beats iPhone Air as Apple's thinnest iPhone, but only when open
- MacRumors — iPhone Duo only works with the USB-C Apple Pencil
- iFixit — Will the iPhone Duo be repairable?
- GSMArena — Galaxy Z Fold8 Ultra specifications
- GSMArena — Galaxy Z Fold8 specifications
Product images of iPhone Duo courtesy of Apple, used unmodified for editorial purposes. Apple, iPhone, MagSafe and Apple Pencil are trademarks of Apple Inc. FoldifyCase is not affiliated with or endorsed by Apple Inc. or Samsung.
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