iPhone Duo guide: Price, specs, availability, problems and reviews
Macworld ·
Macworld Apple’s first foldable iPhone, the iPhone Duo, went on sale on October 23, but getting hold of one could prove difficult. Preorders opened on October 16 and delivery estimates slipped rapidly, with Macworld’s U.S. tracking showing waits stretching to January 25, 2027 within around half an hour. Apple is still accepting orders and made limited stock available to walk-in customers at Apple Stores in the U.S., U.K. and other selected markets on October 23. However, the launch has also brought durability concerns. Some early owners have reported cracks along the inner display’s fold, sometimes accompanied by bright lines across the screen. Some affected customers say Apple has replaced their phones, but the cause and scale of the problem is unclear. Apple published hinge troubleshooting guidance on October 23, explaining that hinge problems have no software remedy and that unresolved cases may require replacement of the inner display assembly. There is no indication of what caused the reported screen cracks. Read more about the iPhone Duo fold problems below. The Duo opens like a book from a compact 5.4-inch phone into a much larger 7.6-inch device. Apple describes the internal screen as its largest-ever iPhone display, with 50 percent more screen area than the iPhone 18 Pro Max , while the outer display provides more than 90 percent of the screen area of an iPhone 18 Pro . The biggest difference compared to previous iPhones is the folding design , but Apple has done more than simply add a hinge. The iPhone Duo ships with iOS 27.1 , which adapts to different positions and orientations with fold-specific interface and multitasking features. These include Split View, hands-free FaceTime and video, StandBy without charging, and layouts that move seamlessly between the two screens. Apple Pencil USB-C support is also coming later in 2026. The other major changes are the 7.6-inch nano-texture inner display , Touch ID replacing Face ID , an A20 Pro processor with vapor-chamber cooling , and a dual-battery system designed around the two halves of the phone. Apple has also introduced camera features that exploit the second screen, including Duo Preview, Smart Take, Kid Cue and Duo FaceTime. Much of the pre-launch reporting proved accurate: the Duo name, book-style design, roughly 7.7- and 5.4-inch screens, Touch ID, two 48MP rear cameras, two front-facing cameras, A20 Pro, C2 modem, MagSafe and the white/dark-blue colors were all anticipated. iPhone Duo at a glance Apple’s first folding iPhone , with 5.4-inch outer and 7.6-inch inner displays. Touch ID replaces Face I D, with the fingerprint sensor incorporated into the side button. A20 Pro with vapor-chamber cooling , including a new 2nm manufacturing process. Dual-battery architecture , giving up to 44 hours of video playback on the outer display. Fold-specific iOS and camera features , including Split View, Duo Preview, Smart Take, Kid Cue and hands-free use. iPhone Duo: Top 10 features Foldable design Book-style titanium design with precision hinge Inner display 7.6-inch Super Retina XDR OLED, 120Hz ProMotion Outer display 5.4-inch Super Retina XDR OLED, 120Hz ProMotion Processor A20 Pro, 6-core CPU, 7-core GPU Neural Engine Dual 16-core Neural Engine Authentication Touch ID in side button Rear cameras 48MP Main + 48MP Ultra Wide Battery Dual batteries; up to 44 hours video on outer screen Connectivity C2 modem, Wi-Fi 7, Bluetooth 6, second-gen UWB Storage 256GB, 512GB, 1TB or 2TB iPhone Duo release date: When did it launch? Apple announced the iPhone Duo on September 9, 2026 , alongside the iPhone 18 Pro and Pro Max. Sales began on October 23 , following preorders on October 16 . The October 23 launch covers more than 70 countries and regions, including the U.S. and U.K., with another 28 markets following on October 30 . The Duo will also be available through Apple Stores, selected carriers and authorized retailers, although availability varies by market. Buy iPhone Duo at Apple U.S. Buy iPhone Duo at Apple U.K. We recommend: Apple iPhone Duo Has the iPhone Duo sold out? Initial delivery allocations sold out rapidly, but Apple has confirmed Apple Stores will have limited iPhone Duo stock for walk-in customers on October 23. As of October 23 , Apple was quoting January 22, 2027 for delivery of the 256GB iPhone Duo in the U.S. and January 25, 2027 in the U.K. Estimates can change and depend on the configuration and delivery location. Apple confirmed that its stores will have limited iPhone Duo stock for walk-in customers when sales begin on October 23. That offers another possibility for buyers facing long online delivery waits, but availability is not guaranteed and will vary by store. If Apple’s delivery estimate is too far away, iPhone stock-checking services may help you locate another option. Apple Inventory Check monitors Apple Store availability, while TrackaLacker covers selected online retailers, including Best Buy and Walmart. Some notification features require registration or payment. Apple described preorder demand as “nothing short of extraordinary” and said it was working to get devices to customers as quickly as possible. Supply constraints may also contribute to the backlog. A late-September report claimed that Apple and its manufacturing partners were experiencing low production yields. Long delivery waits therefore reflect the balance between demand and available supply, rather than revealing how many phones Apple has sold. iPhone Duo design: What does it look like? Britta O’Boyle/Foundry The iPhone Duo uses a book-style folding design . Closed, it is unusually short and wide for an iPhone, measuring 84.1mm wide, 117.8mm tall and 11.3mm thick . Open it and the width expands to 164.6mm , while thickness reduces to just 5.2mm , making it Apple’s thinnest iPhone when unfolded (taking that mantle from the iPhone Air). It weighs 254g . The outer screen measures 5.4 inches , while the folding inner panel measures 7.6 inches . Both are Super Retina XDR OLED displays with ProMotion up to 120Hz, Always-On display support and up to 3,000 nits outdoor peak brightness. The internal display also has a nano-texture surface designed to reduce reflections and make the crease less noticeable. The inner display also has a replaceable top cover layer . AppleCare+ lists replacement at $19, although it must be replaced by Apple rather than peeled off like a conventional screen protector. Apple has not yet published the price without AppleCare+. The frame and hinge cover are made from Grade 5 titanium . Apple uses a mirror-polished finish on the enclosure and a micro-blasted finish on the 3D-printed hinge cover. Ceramic Shield protects the rear, while Ceramic Shield 2 protects the outer display. The phone retains an IP68 rating despite its folding construction. A closed iPhone Duo. Britta O’Boyle/Foundry There are just two colors: Star White and Night Sky , essentially confirming the pre-event reports of silver/white and a very dark blue. For more information read about the iPhone Duo colors. Action button and Camera Control There is Camera Control , giving access to exposure, depth, zoom, cameras, styles and tone. It can also launch the new Siri Camera mode. However, Apple’s Duo doesn’t feature an Action button . The regular iPhone 18 Pro and Pro Max retain both the Action button and Camera Control, so this is one hardware-control compromise of the folding model. Accessories Apple is also launching two dedicated accessories for the foldable: The iPhone Duo Case at $79/£79 The Duo Folio with Kickstand at $129/£129 Both became available to order on October 16. And there are plenty more of the best cases for iPhone Duo in our test reviews. iPhone Duo problems: Screen cracks and hinge concerns Some early iPhone Duo owners have reported cracks along the inner display’s fold, sometimes accompanied by bright lines across the screen. One Australian owner said the damage appeared after around six hours and fewer than 20 openings, and reported receiving an immediate replacement at an Apple Store. These are owner reports; the cause and extent of the problem remain unclear. Apple published an iPhone Duo hinge troubleshooting guide on October 23. It covers devices that do not open or close fully, unexpected noises, loose or damaged hinges, and enclosure damage affecting the mechanism. Apple says there are no software remedies for hinge problems, so restarting, updating or restoring the phone is unnecessary. Its service procedure calls for inspection and, if the problem remains unresolved, replacement of the inner display assembly. Owners experiencing problems should contact Apple or an authorized service provider for assessment. Face ID, Touch ID and the notch Britta O’Boyle/Foundry Perhaps the most surprising difference between the iPhone Duo and Apple’s other flagship iPhones is that there is no Face ID . Instead, Apple has brought back Touch ID , with the fingerprint sensor incorporated into the side button. It works whether the Duo is folded or unfolded, and Apple Watch can also be used to unlock the device. This confirms one of the most persistent pre-launch rumors. The internal display therefore does not need the TrueDepth sensors used for Face ID. Its FaceTime camera sits beneath the display and disappears when it isn’t being used , giving the inner screen a largely uninterrupted surface. The inner camera itself is hidden below the display rather than sitting permanently in a visible camera cutout. And yet, despite this and the absence of Face ID, there is still support for Dynamic Island . Future Duo models could restore Face ID. Bloomberg’s Mark Gurman reports that Apple has tested iPhone Duo 2 prototypes with an under-display Face ID sensor and camera on the outer screen. However, he suggests the technology could arrive with either the second or third generation, so its inclusion in the next model remains uncertain. iPhone Duo cameras: What cameras does it have? There are two cameras on the rear. Britta O’Boyle/Foundry The Duo has a 48MP Dual Fusion camera system , comprising: Camera Resolution Equivalent focal length Aperture Fusion Main 48MP 26mm f/1.6 2x crop from Main 12MP 52mm f/1.6 Fusion Ultra Wide 48MP 13mm f/2.2 Outer front camera 12MP — f/2.2 Inner FaceTime camera Apple does not specify resolution — f/1.8 The Duo does not have variable aperture . Variable aperture is exclusive to the 48MP Fusion Main camera in the iPhone 18 Pro and Pro Max. The biggest camera features for iPhone Duo Duo Preview The outer screen can show a live preview while somebody else is being photographed, allowing the subject to adjust their pose and framing. Smart Take and Kid Cue Smart Take detects when everybody is ready and automatically captures the shot. Kid Cue uses animations on the outer screen to encourage children to look towards the camera. Two-screen shooting The folding design supports unusual shooting configurations, including using the main cameras for selfies or group photos while seeing the composition on the other screen. Duo FaceTime can also put nearby participants onto the outer display. Other notable camera features include 48MP macro photography, a 2x optical-quality crop from the Main camera, an under-display inner FaceTime camera, Dual Capture for simultaneous front-and-rear video, and 4K Dolby Vision recording at up to 120fps. Rear cameras Britta O’Boyle/Foundry The 48MP Fusion Main has an f/1.6 aperture, sensor-shift stabilization and can shoot 24MP or 48MP images. It also provides a 12MP, 2x optical-quality crop equivalent to a 52mm lens. The 48MP Fusion Ultra Wide has a 13mm-equivalent lens, f/2.2 aperture and 120-degree field of view. It also supports 48MP macro photography and is the same Ultra Wide camera used by the iPhone 18 Pro family. That means the Duo does not match the iPhone 18 Pro and Pro Max camera system. Those phones add a dedicated 48MP Fusion Telephoto and variable aperture on the Main camera, making the Pro models much more flexible for photography despite costing substantially less. In his first-day testing, Macworld’s Jason Cross found the Duo’s Main camera fell behind the iPhone 18 Pro in low light , although he was pleased with the Ultra Wide camera. The Duo also lacks the Pro’s shutter-speed adjustment and histogram, while retaining white balance and manual focus with focus peaking. Pre-event reports were divided between a Main + Telephoto and Main + Ultra Wide arrangement. Apple ultimately chose Main + Ultra Wide , confirming the earlier reports that a dedicated telephoto could be sacrificed to save space. Front cameras On the outside is a 12MP Center Stage camera with an f/2.2 aperture . It supports Center Stage, automatic portrait/landscape framing, Dual Capture, Photonic Engine, Deep Fusion, Smart HDR 5 and 4K Dolby Vision video at up to 60fps. Inside is an under-display FaceTime camera with an f/1.8 aperture. Apple does not specify its megapixel resolution. It supports Center Stage for video calls and records at up to 1080p/60fps. Its major advantage is visual rather than photographic: the camera effectively disappears beneath the display when it isn’t being used. iPhone Duo video features The Main camera records 4K Dolby Vision at 24, 25, 30, 60, 100 or 120fps , with 4K/120fps also available for slo-mo. Cinematic mode reaches 4K/60fps and Action mode up to 2.8K/60fps. Dual Capture can record at up to 4K/30fps. Apple’s specifications also do not list ProRes or Apple Log recording for the Duo. Those remain more Pro-oriented capabilities rather than part of Apple’s foldable camera proposition. The Duo does support Spatial Audio recording , Audio Mix, Dolby Vision HDR and Apple’s computational photography features including Photonic Engine, Deep Fusion, Smart HDR 5, Photographic Styles 3, smart focus tracking and Apple Intelligence-powered editing. Apple does not list conventional Spatial Video capture in the Duo specifications. iPhone Duo processor: What processor does it use? Watch video on the screen. Apple The iPhone Duo uses the A20 Pro , the same processor as the iPhone 18 Pro and Pro Max. It is manufactured using a 2-nanometer process , a major step forward in transistor density and efficiency. Apple combines it with a new chip packaging design inspired by its M-series Mac processors. The package connects the A20 Pro directly to a custom vapor chamber to transfer heat away from the processor more effectively. The A20 Pro includes: 6-core CPU: two super cores and four efficiency cores 7-core GPU with Neural Accelerators Dual 16-core Neural Engine Hardware-accelerated ray tracing A dedicated display engine capable of operating both Duo displays Compared with the A19 Pro, Apple says the CPU is up to 20 percent faster , while the GPU is up to 40 percent faster and more power-efficient . The Dual 16-core Neural Engine delivers twice the compute power , while unified-memory bandwidth rises by 50 percent . Apple also claims that the complete thermal system gives the Duo up to 35 percent better sustained performance than the iPhone 17 Pro . That sustained-performance figure is particularly important for a folding device because prolonged gaming, multitasking and AI workloads generate considerably more heat than short benchmark bursts. iPhone Duo RAM: How much memory does it have? Apple has not disclosed how much RAM is inside the iPhone Duo . Before launch, supply-chain reports consistently pointed to 12GB of RAM , which would make sense given the demands of running two displays, simultaneous applications, Siri AI and larger on-device AI models. Apple does reveal that A20 Pro has 50 percent more unified-memory bandwidth than A19 Pro , which should help the Duo move data more quickly between the CPU, GPU and Neural Engine. Extra memory is particularly useful on the Duo because iOS 27.1 can display multiple apps simultaneously and because Apple Intelligence and Siri AI increasingly run generative models locally rather than relying entirely on cloud processing. iPhone Duo connectivity Folded iPhone Duo. Britta O’Boyle Apple has put a significant amount of its own communications silicon into the iPhone Duo. It uses Apple’s new C2 cellular modem , replacing Qualcomm silicon. Apple says C2 introduces AI-powered improvements to cellular quality and reliability and supports mmWave 5G in the U.S. The N1 wireless networking chip provides: Wi-Fi 7 with 2×2 MIMO Bluetooth 6 Thread networking The USB-C port also supports USB 3 data transfers at up to 10Gbps and DisplayPort video output. The Duo also has Apple’s second-generation Ultra Wideband chip , NFC and precision dual-frequency GPS. It is eSIM-only worldwide , something that had been widely rumored before launch. Eliminating the SIM tray gives Apple additional internal space for its batteries. iPhone Handoff – a feature introduced with iOS 27 – makes it easier to use an iPhone Duo alongside another iPhone without needing separate phone numbers. Both devices share your number, with calls, voicemail, messages and Find My location following whichever iPhone you unlock. Only one phone is active at a time. You could use the Duo’s folding display for work, then switch to an iPhone Pro when you want its telephoto camera. Both phones need iOS 27, eSIM support and the same Apple Account, with Messages in iCloud enabled. Your carrier must specifically support iPhone Handoff, and your plan may require an additional monthly fee for access. T-Mobile already offers iPhone Handoff for $5 a month; Verizon and EE (in the U.K.) plan support. Fees may apply. Satellite capabilities include: Emergency SOS via satellite Roadside Assistance via satellite Find My via satellite Messages via satellite Battery, MagSafe and charging: What’s available? Instead of one battery spanning the body, the iPhone Duo contains two rechargeable lithium-ion batteries , with one high-energy battery fitted into each half of the device. Apple’s energy-balancing algorithms make them operate as a single battery system. Apple rates battery life at: Up to 24 hours of typical use Up to 44 hours video playback using the outer display Up to 31 hours using the inner display Up to 37 hours streamed video on the outer screen Up to 26 hours streamed video on the inner display Early reviewers reported different battery experiences. CNET found the Duo comfortably lasted through a busy day, while The Verge questioned whether it could manage a full day of heavy use. These observations reflect different usage patterns and testing methods, so they should not be treated as directly comparable results or replacements for Apple’s playback ratings above. After using the Duo as her main phone for a week , Macworld contributor Britta O’Boyle generally finished her mixed-use days with around 25 percent battery remaining. In her experience, it outlasted the smaller iPhone 18 Pro but fell slightly short of the Pro Max. These are everyday-use observations rather than directly comparable laboratory benchmarks. Apple has not disclosed the batteries’ combined capacity in mAh. The pre-launch rumor of approximately 5,000-5,500mAh therefore remains unconfirmed. Apple says the iPhone Duo can reach 50 percent charge in around 20 minutes using a USB-C charging cable and a 60W-capable power adapter or higher. Britta O’Boyle’s charging test broadly matched Apple’s claim: using a 60W adapter, she reached approximately 50 percent from empty in around 20 minutes. MagSafe and Qi2 wireless charging are supported at up to 25W. Apple’s claimed 50 percent charge in around 30 minutes requires a MagSafe charger paired with a 35W-or-higher power adapter. In both the U.S. and U.K., the box includes the iPhone Duo and a 1-meter USB-C charging cable, but no power adapter. The MagSafe charger is also sold separately, so factor these accessories into your budget if you don’t already own suitable equipment. iPhone Duo price: How much does it cost? The iPhone Duo starts at $1,999 in the U.S. and £1,999 in the U.K. for 256GB. Prices are: Storage Price 256GB $1,999/£1,999 512GB $2,199/£2,199 1TB $2,599/£2,599 2TB $3,199/£3,199 The 256GB starting capacity means Apple has not created an unusually low-storage entry model simply to make the headline price look lower. iPhone Duo vs iPhone 18 Pro pricing The iPhone 18 Pro starts at $1,199/£1,199 , while the iPhone 18 Pro Max starts at $1,299/£1,299 . That makes the Duo approximately $700/£700 more expensive than the Pro Max at entry level. That premium buys the folding display, precision hinge, titanium structure, second screen and more complex dual-battery design rather than superior cameras: in several areas the iPhone 18 Pro models are actually better equipped. Reports before the launch suggested the Duo could cost anywhere from around $1,999 to $2,399 at entry level, largely because of the folding OLED display, hinge mechanism, titanium components and other expensive parts. Apple ultimately landed at the very bottom of those predictions. iPhone Duo software: Multitasking and Apple Pencil support Britta O’Boyle The iPhone Duo’s larger inner display enables Split View, letting you use two apps side by side. For example, you could keep Safari open while taking notes, or check your calendar alongside a conversation in Messages. Supported apps can also open two windows of their own: Safari can display two webpages side by side for comparison shopping. You can save pairs of apps to return to later. App compatibility varies considerably. Macworld’s Jason Cross identified three broad experiences: older apps with fixed layouts and black borders; apps updated for iOS 27 that resize across the displays; and fully Duo-optimized apps that adapt to its different positions. Outlook already supports resizing, although its fuller Duo-specific update remains forthcoming. Jason also encountered a glitch when opening Kindle’s reading menu, so check essential apps before buying. App support is improving, however. Apple has highlighted that Netflix, Fantastical, MLB and Asphalt Legends will be among the apps optimized for launch, and says compatible apps carry a “ Made for iPhone Duo ” badge on their App Store product pages. Other updates are still coming: Microsoft Word and Outlook’s Duo-specific layouts are due in the coming weeks, while Zenless Zone Zero’s update is scheduled for November. StandBy also works differently on the Duo. Set the phone down and it can display a clock, photos or widgets on either screen without being connected to a charger. New Calendar and Weather faces join the existing options. Apple Pencil support is coming later in 2026. Apple has announced compatibility with the Apple Pencil (USB-C), allowing users to write, sketch and mark up documents on either display. What do the first iPhone Duo reviews say? The first independent reviews praise the Duo’s hinge, display and overall hardware design, while highlighting uneven app optimization and differing battery experiences. Reviewers generally enjoyed the folding experience, but their findings reinforce the importance of checking whether it suits your everyday needs. Should you buy the iPhone Duo? Britta O’Boyle The iPhone Duo is the iPhone to buy if you genuinely want a phone and small tablet in one device. Its 7.6-inch display, multitasking features, A20 Pro performance and clever fold-specific camera modes offer capabilities no other iPhone has. But at $1,999/£1,999 it is enormously expensive, and there are significant compromises: no Face ID, no dedicated telephoto camera, no variable aperture and no Action button. Early reports of hinge-area screen damage add another consideration for buyers. Although the cause and frequency remain unclear, anyone concerned about first-generation durability may prefer to wait for further investigation and longer-term testing before spending $1,999/£1,999. For photography, battery life and conventional everyday use, the iPhone 18 Pro Max is likely to be the better-value flagship. Buy the Duo because you want the folding experience, not because it is simply the “best” iPhone . Read: When is the best time to buy an iPhone and our iPhone Buying Guide .