Everything we found out about the iPhone Duo

It took fifteen years

Apple filed its first bending-phone patents in 2011. One of six names on the second is John Ternus. He became CEO on 1 September 2026 and showed the Duo eight days later. Around 2020 Tim Cook came back from Asia excited after watching people use Samsung and Huawei foldables and pushed it. It started as an iPad mini that unfolds. Inside Apple it was V68. Analysts said it would ship in 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2027 and 2028.

The hinge has more than 100 parts. The first supplier couldn't make enough good ones; the second was reportedly picking good hinges by hand for Foxconn. In mid September only about 60% of finished phones passed. The name came from a 9to5Mac writer's Slack message in 2025.

What Apple built

5.2 mm open, the thinnest iPhone ever. 11.3 mm shut, the thickest since the 3GS in 2009. 254 grams, heavier than any of the big rival foldables. A 7.6 inch screen inside and a 5.4 inch one outside, and if you fold the inner screen in half you get almost exactly the outer one: 5.36 inches. Two rear cameras, where the cheaper 18 Pro has three; the "2x telephoto" is the middle of the main sensor. No Face ID, just a fingerprint reader in the side button.

Apple says the inner screen has more than ten layers. On top is a matte plastic, not glass, made from "a custom polymer with up to 40 percent higher stiffness". Below it come glass, the folding panel, more glass and a titanium plate, held by glues that "allow the layers to glide past one another like the pages of a book". The chip sits right on a vapor chamber to move heat, and PCMag reported a flexible graphite pipe that carries heat across the hinge to the other half.

Apple changed iOS 27 for it. For the first time an iPhone runs two apps side by side, though only at a fixed half and half. The Dock and the Dynamic Island move to the side. Open, you get two home screen pages at once. Apps follow you between screens when you open or shut it. It stands up five ways, and StandBy works on either screen without a charger. At launch Apple named three apps ready for it: Netflix, Zoom and Slack.

The first twelve hours

The keynote ended at about 2:17 pm New York time on 9 September. Apple let reporters try the phone straight after, and asked them not to photograph it next to a Galaxy Z Fold8 or a Pixel Fold. Wirecutter got about 45 minutes. Mashable got "a few minutes alone" after "mostly begging".

The Verge's hands-on went up at 2:38 pm: "the crease is almost impossible to find with my finger." Brian Tong posted the first video eight minutes later. Gizmodo at 3:10 pm: "Notably, the crease is not completely invisible." Tom's Guide: "Apple nailed it, and just put everyone else on notice." The Wall Street Journal's Nicole Nguyen: "Maybe I don't need my iPad Mini anymore."

YouTube views on 4 November, in millions. The hands-ons from before anyone had the phone for more than minutes beat the real reviews.

Reviews came after the money

Pre-orders opened 16 October and sold out within minutes. The reviews were held until 21 October at exactly 12:00 UTC: 8 am in New York, 5 am for every big YouTuber in California, 8 pm in Beijing, 9 pm in Tokyo, 11 pm on a Wednesday in Sydney. Stern's newsletter opened: "Good morning! It's 8:00 a.m. ET, Apple has lifted the embargo and I can FINALLY tell you all about my week testing the iPhone Duo!" Engadget had warned buyers they would be ordering "without first checking out the results of independent testing."

Most reviewers had the phone for about a week. MacStories, the most devoted Apple app blog, got its unit only on review day, at a developer event in New York. Six Colors expected its unit a day or two later. A Saudi channel leaked an unboxing on 20 October.

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What it costs

$1,999 to $3,199 in America, $800 more than an iPhone 18 Pro at every size. Apple picked $1,999 to echo the $999 iPhone X. In the UK it is £1,999, the same number. Apple's case is $79 and the Folio with a stand is $129. AppleCare+ is $399, and with it a broken inner screen costs $99 to fix instead of $999.

256 GB model, from Apple's own online stores on 4 November 2026. China and Korea from local reports.

Nobody agrees how many will sell in the first year. The guesses are seven times apart.

Phones in the first year, millions. Apple raised its supplier order 44%, from 9.7 million to 14 million, but with about 60% of finished phones passing checks in September, a bigger order does not mean more phones.

Resale moved fast. On eBay the 2 TB fell from over $7,000 to about $4,000 in a week. In Shanghai, the premium on a 1 TB fell from 2,200 yuan to 1,600 by mid-morning on launch day. A Hong Kong reseller expected "a few meals' worth of money" in profit. Apple's shares fell 0.28% on the day of the keynote and rose 3.56% the next.

The reviews

The review ban lifted at noon UTC on 21 October. Twenty-one scored reviews average 80 out of 100: eleven say buy it, ten are mixed. AVForums published a week early, on 14 October.

Scores out of 10, bars start at zero.

John Gruber gave no score and would not buy one. The outside is "the worst iPhone Apple has ever made". The inside is "a splendid, joyful, beautiful tablet, with a UI that out-iPads the iPad". Every time you pick it up "you face The Decision": which screen. He called it "an extraordinarily polished prototype".

Ars Technica: "technically impressive but not always enjoyable to use." PetaPixel: "I just don't think it solves any problems the iPad doesn't already address." Wirecutter: "You don't need me to tell you that you don't need to spend $2,000 on a phone."

More first lines from 21 October. 9to5Mac: "The biggest change to the iPhone's form factor in its nearly 20-year history." PetaPixel: "The iPhone Duo pulls me in two directions." CNET: "It's refreshing to use a phone that breaks from the bar-style design." GQ UK: "Apple's £2,000 iPhone Duo has ruined normal phones for me." The Telegraph: "best in class, but it lacks a key security feature." PCMag: "easily the best folding phone you can buy today." WAtoday in Sydney: "I'd wait a year for the second generation."

Joanna Stern, now on her own after leaving the Journal, built a folding robot she named Hingey. Her verdict: "a beautiful, surprisingly durable piece of hardware." Two days later the first cracked screens appeared. Mrwhosetheboss: "For a $2,000 phone, I expected a significantly better day one app experience."

The video reviews

Marques Brownlee, "First Generation Fun!" 13.4 million views

He used it for a week and a half and called it "very polished around the edges, but kind of rough in the middle". The inner screen "does not feel first generation at all. They did an incredible job with it." His biggest complaint was apps: Spotify, Google Maps, Discord, X and Google Calendar weren't ready, so some open with black bars and some as small iPhone apps on the big screen. He thinks Face ID is "the number one thing people miss coming from other iPhones. Not the zoom cameras." Its best trick is sitting half open, "probably the best foldable at just being partially open". His advice: most people shouldn't buy it, current iPhone owners included. Weaker battery, speakers and cameras? "That's just physics."

Joanna Stern, "We Put Apple's iPhone Duo Through HELL" 664,000 views

Seven days of tests. A robot called Hingey folded it 32,640 times over four nights, 17 folds a minute, in a case, opening to about 130 degrees; afterwards the hinge was "a little bit stiffer" but felt like day one. She took the matte screen onto the Hudson, where it beat the glare, though fingerprints "seep into the screen": "Apple, you could have included the $9 polishing cloth with the $2,000 phone." On a FaceTime call it got so hot she hung up: "I'm gonna burn my hand off." To third-party apps: "You're drunk. They're sloppy." And to Face ID: "I cannot tell you how deeply I miss you. Please come back."

The Verge, "iPhone Duo review (emotional)" 540,000 views

Nilay Patel and Allison Johnson. Both screens are 1.4 to 1, so the outside one is small: "It's like having an iPhone 5 in a world of iPhone Pro Maxes." With the keyboard up you see two or three texts. The crease you mostly can't see but "can definitely feel". The under-screen FaceTime camera is 4 MP, "really quite bad in dim light". Nilay charged at least once every workday; Allison had about 30% left after 6.5 hours of screen time. Against the Galaxy Z Fold8: the Duo is thicker, heavier and more polished, Samsung has the better outside screen. They compare it to the first MacBook Air, which "took exactly no one by storm".

JerryRigEverything, "Durability: Destroyed" 15.7 million views

The outside glass scratched at level 7, like any iPhone. The inside screen scratched at level 2: his fingernail, keys and coins all marked it, and the marks vanish when the screen is on. Dust got into the titanium hinge until the magnets couldn't hold it shut. The first bend left a green line across the inner screen, the second added two more, then it stopped responding. On a second phone he peeled the matte layer off; colours got brighter and the glare came back. "I've been testing these folding phones since the first generation seven years ago, most do survive. The iPhone Duo did not."

HTX Studio, "After 3,000 Folds" 5.2 million views

They scanned the screen surface: 48 microns deep new, 167 after 3,000 machine folds, and softer around the fold. They couldn't open the review unit, so they CT-scanned it and built a 3D model: gears keep both halves turning together, springs press on cams for friction, magnets pull it shut, and the folded screen makes a teardrop loop about 3.85 mm across. In 30 minutes of gaming it hit 46.5°C against 43.8°C for the 18 Pro, ran about 20% slower and dimmed from 300 to 185 nits. Their tip: charge it open so the crease can settle.

Kuba Klawiter, "After 75,000 Folds by Humans" 130,000 views

A Polish tech YouTuber let livestream viewers fold the phone by hand, all the way shut. It was fine to 50,000. Then they added pocket dust, and by 60,000 the crease had changed. At 75,003, during a cold stage meant to copy minus 10 to minus 20 degrees, lines appeared across the inner screen. He had expected 300,000 to 400,000.

iJustine called it "a content viewing machine", then posted that hers "has been working great because I have not actively tried to break it", which Mark Gurman called engagement bait. Unbox Therapy's first Duo video came on 24 October, three days after review day.

What they all complained about

No Face ID: you unlock with your thumb on the side button. The weight, 254 grams. The price. Apps that don't use the big screen yet: on review day only Perplexity and Claude did, per Max Weinbach. A 50/50 split view you can't resize. Every control on the right. No ProRAW or ProRes on a $2,000 phone, and it gets hot. What they all praised: the hinge, and a crease you mostly can't see.

First look against what happened

At the September event Joanna Stern said: "I see no crease whatsoever." Six weeks later iFixit peeled off the matte film and found the crease is arguably worse than Samsung's; the film is what hides it.

The reviews outside America

China. Ifanr's review went up at exactly 8 pm Beijing time. Battery "slightly better than the iPhone 18 Pro". Touch ID is "hard to call an upgrade". Their advice: wait two months for the apps. MediaStorm bent it backwards on a force gauge to 37.8 kilograms and told viewers not to worry about sitting on it. Most Chinese comparisons with Huawei were promotional, and one widely shared "crease analysis" says in its own footer that AI wrote it.

Japan. Gizmodo Japan noticed the box first: the Duo ships open, wrapped in film like an iPad. With Apple's case it weighs 311 grams. Kindle shows as a thin strip. MagSafe rings fall off more easily because the magnet isn't at the centre of the weight. Touch ID may not work with a plaster on your thumb.

Korea. ₩3,290,000, more than ₩1 million above the Galaxy Z Fold8. MoneyToday found the inner screen "relatively hazy, colours washed out" next to Samsung's, and the sideways photo bug. The YouTuber ITSub says the hinge is smooth to 25 degrees, holds any angle to about 150, then snaps flat by itself past 170.

Russia. No official sales. Kod.ru noticed the keyboard takes the full width even when you type in one of two split windows. India. No stock in stores on launch day, the same in nine other countries including China, Japan and the UAE.

Things almost nobody noticed

Shutting it doesn't lock it. Your app jumps to the outer screen and keeps running. Gruber kept getting accidental unlocks "at least once a day". Only the $129 Folio case's flap puts it to sleep.

The volume buttons don't turn with the phone. "Fixed Position Volume Controls" is on by default, so on a phone with five ways to hold it, up is often down.

Hold it open upright and it takes a landscape photo. Hold it sideways and you get portrait. A Korean reviewer found this after a week. No English review mentions it.

There is no SIM tray. In China, eSIMs must be set up in a shop with ID, you can hold two at most, and to add a travel number you delete your home one.

The matte screen is a sticker you can peel off, and setup never warns you. It scratches at level 2 on the hardness scale. Replacing it costs $49, or $19 with AppleCare.

The famous 32,000-fold test never shut the phone. Stern's robot opened it to about 130 degrees, in a case. The hand-folding test that killed it at 75,003 shut it all the way, with grit and ice.

You can't swipe back from the right edge. There's a "Shift Left Edge" setting for cases. Heat builds on the right side. Reviewers describe the closing sound as a thud, a thunk and a click.

In Korea, reviews split by who paid. Creators on Apple loan units praised it; creators who bought their own didn't, and their viewers pointed it out.

Need a break from phones? Today's Long Story Short takes about two minutes.

The owners

On launch day, an owner in Australia posted to r/iPhoneDuo: "Had my iPhone Duo for about six hours and had probably opened it fewer than 20 times." He felt something under the screen near the hinge, then heard "an audible crack". Apple swapped it on the spot. MacRumors' thread on it, "Crackgate?", has 689 comments.

A Wall Street Journal reader, Jesse Dalton, "felt blind panic" when his hinge stuck at 45 degrees after four or five opens. In an Apple Store, a demo employee was telling people to press the bottom middle of the hinge to shut it.

Still, a MacRumors poll of 272 owners found 82% love theirs. "Day 6 with the Duo. And I'm probably never going back to Slab phone again." Another: "Side-by-side apps is everything." Someone who sent theirs back wrote "I really, really missed Face ID."

Apple, 26 October: it is "aware of an issue impacting the inner display on a small number of iPhone Duo units". It gave no cause and no count, and on 30 October said there would be no recall.

Taken apart

iFixit gave it 5 out of 10 on 25 October, the best any folding phone has had. The batteries pop out with a 9 volt battery. A new inner screen is $999 from Apple, against $579 for Samsung's.

Where the screens crack

iFixit laid a CT scan over a broken screen. The damage sits just below where a folded ribbon cable passes through the hinge. Their guess, not proven, is that a support bar there doesn't drop far enough when you shut it, so the screen lands on it.

That cable also charges the second battery. Only one half of the phone has charging parts, so power for the other half crosses the fold every time.

Fold tests: Stern's robot, 32,640 with no wear. CNET, past 60,000. A Polish YouTuber's viewers folded one by hand, adding dust and cold: it died at 75,003. Samsung rates its Fold8 for 500,000. Apple gives no number.

What Apple's own paperwork says

Apple's repair manual for the Duo came out on 23 October. You cannot buy a hinge. Every hinge fault, from a noise to a phone that won't shut, ends in replacing the whole inner screen half and moving nine parts across. Apple's words: "There aren't diagnostics or software remedies for hinge issues."

Putting a new matte layer on starts with a sticky note. A rig with micrometer knobs lines it up ("add 13"), then a roller presses it on at 20 degrees, lifting to 70 over the hinge "to avoid creating air bubbles". The inner screen is glued in with 21 syringes and left for an hour, and the job needs seven torque screwdrivers. The batteries come off when you run a 9 volt battery through the glue.

The EU label. Every phone sold in Europe since June 2025 carries one. The Duo's: 51.5 hours a charge, 1,000 charges before the battery drops to 80%. It survived 140 drops shut and 35 open, exactly the minimum the EU sets for a folding phone. Repair grade C, 2.65 points, which clears D by 0.10. The iPhone 18 Pro gets 52 hours from a battery 20% smaller, survives 180 drops, and scores 3.14. The label has no box for how many times it folds.

Carbon to make, ship, use and recycle, kg CO2e, from Apple's environmental reports. 75 of the base Duo's 93 kg come from making it.

The developer papers show what the phone knows about itself. Apps can read the hinge angle in radians, and whether the phone is closed, partly open, fully open or unknown. The fold down the middle is a "reserved region" apps are told to keep buttons out of. Apple's screenshot size for the inner screen, 2007 by 2853, doesn't match the 1878 by 2670 on its own spec sheet.

The filings. Four models, none with a SIM tray. Inside Apple's code it is iPhone19,4. The US testing lab received Duos on 10 November 2025, almost a year before launch, and found at least 14 antennas. Apple's accessibility report calls it a phone with "a 7.6-inch screen" and never mentions folding. The controls sit on the right "to make them easier to reach with your right thumb", even in Arabic and Hebrew. There is no left-handed setting.

Hacker News

The biggest argument, 212 replies: the inner screen is the shape of A4 paper. Then: is $2,000 better than an iPad mini plus a phone? Microsoft's Surface Duo used the name and the shape first. A 75 year old wrote that he could picture himself "just wanting a single digital device like a future version of this product."

Six weeks in

Every model is still sold out into January. On 2 November Ternus told Reuters Apple is "not able to predict when supply and demand will be in balance."

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