H1: iPhone Duo review: Is Apple’s first foldable worth buying? [US]

TL;DR: iPhone Duo foldable review

✨The iPhone Duo is admittedly a novelty item as the first Apple foldable iPhone, but its hefty launch price of $1,999 shows it. The iPhone Duo does, however, boast the largest iPhone display ever when open, and it’s also the thinnest iPhone ever when it’s unfolded. This sleek, compact design is easy to use one-handed and store in your pocket when closed, while the larger screen when open offers tablet-like capabilities if you’re gaming or multitasking. Apple promises structural durability with grade 5 titanium, but only real-world use once the phone becomes available will truly tell how durable key components, such as the hinge, actually are. With high-quality displays, the new A20 Pro chipset, and enhanced AI features available via iOS 27, the iPhone Duo promises to be one of the best iPhones yet, especially for those interested in the novelty of foldable phones. However, it may not be worth the price for budget-conscious buyers, those who already own a tablet or a recent iPhone Pro model, or anyone worried about the risks that inevitably come with a first-generation piece of tech. Those who are eager to get their hands on the tech but are turned off by the launch price have the option of buying a refurbished iPhone Duo once they become available.

Why can you trust our iPhone Duo review?

At Back Market, we aim to make tech reliable, sustainable, and affordable by giving used tech a new life. To this end, we work with professional third-party refurbishers who inspect, clean, repair, and test tech day in and day out, including iPhones and foldable phones made by other brands such as Samsung and Google. While the iPhone Duo isn’t available quite yet, with pre-orders starting on October 16, our refurbishers can still speak to how the confirmed specs measure up to the tech they work with every day.

In addition, we’re always keeping up to date on the latest tech news, including reviews and tests by trusted tech publications and comments from real-world potential buyers. We understand what users are looking for in their smartphones, and we work diligently to present our unbiased take on the features that actually matter. This way, this foldable iPhone review can help you decide whether to pre-order the iPhone Duo right this second, wait for the phone to hit the refurbished market, or opt for another smartphone altogether.

What are the specifications of the iPhone Duo?

✨ The iPhone Duo specs are undeniably impressive display- and performance-wise, especially for Apple’s first foldable model, but keep in mind that specs alone don’t tell the full story.

What are the iPhone Duo features and benefits?

The iPhone Duo has the advantage of being the shiny new device that everyone oohs and aahs over for a while — but does it deserve the hype? Let’s dive into the Duo’s features and benefits to discover its strengths and potential weaknesses, and determine whether it’s worth the price.

How is the iPhone Duo’s performance?

✨The iPhone Duo is powered by the A20 Pro chip, the same one as the iPhone 18 Pro, offering strong performance and AI features.

“Powered by A20 Pro — the same chip in iPhone 18 Pro models — and paired with an advanced thermal management system, iPhone Duo delivers up to 35 percent better sustained performance than iPhone 17 Pro.” — Apple

The iPhone Duo comes with the same powerful A20 Pro chip as the new iPhone 18 Pro and Pro Max, giving you a Pro experience even without a Pro model. This chip comes with a dual 16-core Neural Engine along with a 6-core CPU and 7-core GPU with Neural Accelerators, ensuring graphics and transitions run smoothly, even when using the inner display to run demanding gaming apps.

The design of the chipset package was inspired by Apple’s infamous M-series chips with a vapor chamber, allowing the phone to manage heat and more reliably handle heavy AI workloads. This means the phone’s performance should stay fluid and fast, and the phone itself should stay cool to the touch, even when you’re working it pretty hard.

This chipset combined with the enhanced Apple Intelligence features that come with iOS 27 makes the phone even more useful if you’re someone who relies on AI tools like Siri, Image Playground, Clean Up, or Notify Me. These features on a tablet-like device can significantly enhance productivity and media consumption experiences.

When it comes to performance, there’s not really a downside here.

How are the iPhone Duo’s displays?

✨The iPhone Duo’s displays are where this phone really shines. With ProMotion technology, the same aspect ratio across both screens, and 3,000 nits peak outdoor brightness, you’ll have all you need and more display-wise.

The iPhone Duo’s displays are some of the best you’ll find, not just on any foldable phone, but on any smartphone today.

The Duo displays enjoy all the same perks of an iPhone Pro model. Both the inner and outer screens boast ProMotion technology, meaning you have an adaptive refresh rate from 1Hz to 120Hz, offering fluid transitions and impeccable graphics performance. A peak outdoor brightness of 3,000 nits makes visibility clear even in sunny conditions, and you also get the Dynamic Island and Always On display features.

The inner display is built for durability with a nano-texture finish and a scratch-resistant coating. This finish both reduces glare and also minimizes the crease in the middle of the screen, providing a smooth viewing experience. The inner display crease is perhaps one of the most common concerns people have with foldable phones. On models like the newer Galaxy Z Folds, the crease is definitely visible, but it’s minimal. On the iPhone Duo, though, TechRadar says “the crease is gone”. While you’ll be able to feel it if you touch it, the nano-texture layer disperses light and gives the display a matte appearance, making the crease virtually invisible.

The new FaceTime camera also stays hidden beneath the inner display, ensuring uninterrupted screentime when the camera isn’t actually in use. This does, however, come with some compromises in camera quality — more on that later.

Perhaps the biggest advantage of these displays, though, is that they both have the same aspect ratio — something that many displays on other foldable phones lack. Why does this matter? Well, the 1.414:1 aspect ratio can be folded into itself infinitely, so the outer screen, even though it’s smaller than the inner screen, can mirror the inner screen as a perfect half. This allows for even more seamless transitions when switching between the two displays — a design choice that feels intuitive to how people actually use their foldables.

Apple has also stated that support for the Apple Pencil via USB-C will arrive later this year, so you can easily sketch and make annotations on either screen. However, when exactly this happens remains to be seen.

How is the iPhone Duo’s design?

✨The iPhone Duo’s passport-shaped design is sleek, modern, durable, and compact, allowing for easy one-handed use and pocket carrying.

The iPhone Duo’s design is durable and comfortable. Made of grade 5 titanium, its build materials are much more durable than that of even the newest iPhone Pro models, which are made of aluminum. The phone has an IP68 rating for dust and water resistance, and the titanium is polished to the shine level of a mirror, giving the phone a premium look.

The iPhone Duo durability also extends to the screens: high-strength glass sandwiches the display panel on the inside, allowing the sides to glide past each other instead of rubbing against each other. The front display is made of Ceramic Shield 2 glass, which is 3x more scratch-resistant than previous-generation Ceramic Shield glass.

Hinge durability, though, is what many are concerned about when it comes to foldable phones. Apple has taken great care designing the hinge with over 100 components, allowing it to control the opening and closing of the phone and support the crease area when the phone is open. The design also includes a hinge cover for extra strength.

The phone’s passport shape — squat and wide rather than tall — also makes for easy one-handed use. When closed, the phone looks like a little booklet, with the hinge side having rectangular corners and the side that opens having rounded corners. When open, this means that all four corners are rounded, making it comfortable to handle. And when open, the 7.6-inch screen is only a little smaller than that of the iPad mini tablet.

In addition, you can open the foldable only halfway, setting it up in a sort of tent shape. This feature makes the Duo especially useful for StandBy mode, which enables you to use your phone as a photo frame or a bedside alarm clock. Typical iPhones also have this mode, but they need to be propped up on their side and locked. The foldable phone, however, can stand propped up on its own, making it even more useful.

The iPhone Duo does, however, remove the Action Button in a major design change. The Action Button, which is typically located on the left side of the phone and could be customized in settings, was introduced with the iPhone 15 Pro, and every iPhone released since then has had one — until now. Practically, this means that the iPhone Duo is the first iPhone since then without a physical option for toggling between the traditional ring and Silent mode. Now, you need to toggle Silent mode via the Control Center in Settings.

If you live with your phone on Silent mode, this may not matter much, but if you often switch between the two modes or you customized your Action Button to perform another function, you may miss it. Now, most things will need to be toggled in the Control Center, so there’s an extra step added. In addition, if your display suddenly stops working, you’ll be out of luck when it comes to physically muting your device.

iPhone Duo camera review: How does it perform?

✨The iPhone Duo’s camera system is a little lacking compared to the rest of the specs and compared to new iPhone Pro models, with only a dual-lens setup at 48MP.

The iPhone Duo has a 48MP Dual Fusion camera system in the rear and a 12MP Center Stage front camera. While these lenses, especially the rear ones, are good and can capture high-resolution photos, they’re not nearly as good as they could be. The iPhone 18 Pro models, for example, offer a Pro triple-lens setup in the rear with a dedicated telephoto lens — and the Pro models are significantly cheaper than the Duo.

The lack of a dedicated telephoto lens on the Duo is especially noticeable for those who enjoy taking photos at concerts and sports events. It’s also worth noting that the optical zoom capabilities on the Duo don’t match up to those of the 18 Pro models; whereas the iPhone 18 Pro reaches up to 8x optical zoom, the Duo can only get up to 2x optical zoom. The Duo is also missing the variable aperture modes available on the newest Pro models, resulting in less favorable low-light performance.

The iPhone Duo’s selfie camera on the outer display also gets a downgrade: whereas the iPhone 18 Pro and even the iPhone 17 Pro enjoy 18MP selfie cams, the Duo’s is only 12MP. In practice, this means fuzzier images when FaceTiming with family and, of course, less crisp selfies. While this may not be an issue for some, it does make the phone feel significantly less advanced.

There is also a new under-display FaceTime camera on the inner display, but Apple does not specify its resolution. Under-display cameras, however, are generally known to produce less clear images thanks to the glass panel between the lens and the subject. MacRumors suggests that the camera may be between 2MP and 8MP due to its 1080p and 60fps video recording capabilities. While it may be useful for occasional video calls, we recommend using the 12MP selfie camera for crisper photos. It is worth noting, though, that the nano-texture layer on the rest of the inner screen does not cover the under-display camera, allowing for clearer photos than it could take otherwise, but also leaving a glossy spot on the screen where there is no coating.

For video, the Duo notably does not support ProRes, so professional video content creation is better done on an iPhone Pro model.

For all it lacks camera-wise, though, the Duo does boast some new features that are exclusive to this foldable phone. Duo Preview, for example, allows the subject to see themselves in the cover display while someone takes a photo of them. Smart Take, on the other hand, can detect when the subjects are ready and automatically take the photo, eliminating the hassle of timers.

If iPhone photography is a priority, the Duo probably isn’t for you. Instead, check out our iPhone 18 Pro review — the camera is more advanced and suited for professional content creators.

How is the iPhone Duo’s battery life?

✨The iPhone Duo’s battery life is just a little bit less than that of the 18 Pro Max at 44 hours of video playback using the outer display and 31 hours of video playback using the inner display.

The iPhone Duo is rated for 31 hours of video playback using the inner screen and 44 hours of video playback using the outer screen, according to Apple’s official specs page. With one battery on each side of the foldable phone, Apple also promises up to 24 hours on a single charge when both screens are used equally. How the phone holds up in real life is yet to be seen, but these are some pretty impressive promises.

Realistically, with these numbers, we would expect the phone to comfortably last for a full day of work if you’re simply sending emails, reading documents, or marking up PDFs, whether you’re using the inner or outer display. Video calls, multitasking, and demanding games may drain the battery more quickly, especially if you’re primarily using the inner screen. If you’re simply streaming content while traveling, it should comfortably last a full day as well.

The good news, though, is that the iPhone Duo also supports fast charging, capable of reaching 50% in about 20 minutes with a USB-C charger and up to 30 minutes with a Qi2 or MagSafe charger. So, even if you do need a top-up, it shouldn't take too long. The Duo is also compatible with MagSafe cases and wireless chargers — but it is not compatible with the MagSafe wallet and MagSafe battery packs, unlike many other iPhones. This is because the smaller size of the Duo when folded just doesn’t support the wallet: the MagSafe wallet will hang off the sides since it can’t go over the camera bump. The MagSafe battery packs also don’t fit on the back due to the camera bump.

This impressive all-day battery life rivals even the newest Galaxy phones, which promise around 26 hours of video playback under certain conditions.

Does the iPhone Duo have Face ID?

✨The iPhone Duo does not have Face ID; it instead reverts to Touch ID integrated into the side button.

Another modern feature the Duo is missing is Face ID. While most iPhones today have this feature, the lack of it on the iPhone Duo is notable. Instead, the Duo integrates Touch ID into its side button, which can be used for authentication whether the foldable is open or closed. The phone can also be unlocked via your Apple Watch.

If you’re not a fan of Face ID due to privacy or other security concerns, you may be happy to hear about the return to Touch ID on this phone, but in some circumstances, the lack of Face ID can be incredibly inconvenient. If, for example, you’re wearing winter gloves, you’ll be unable to unlock your phone without taking off the gloves. This is true even if you fall back to passcode authentication.

What are the iPhone Duo pros and cons?

✨ The iPhone Duo offers a compact and intuitive design, incredible displays, and impressive battery life and performance, but its less-than-stellar cameras and lack of Face ID make an expensive phone feel less worth it.

Is the iPhone Duo worth it compared to competitors?

Whether the iPhone Duo is worth purchasing instead of other iPhones or other foldable phones from different brands depends heavily on your priorities and your budget. The iPhone Duo’s main competitors today include the latest iPhone Pro models (iPhone 18 Pro and Pro Max), the latest Galaxy Z Fold models, and the latest Google Pixel Folds. Let’s dive into each one to see how they compare.

iPhone Duo vs iPhone 18 Pro Max: Which is better?

The short answer? The iPhone 18 Pro Max is a better phone than the iPhone Duo, and it’s also cheaper. Not only does the Pro Max have a slightly longer battery life at up to 45 hours of video playback, but it also has a Pro triple-lens camera setup and an 18MP selfie camera, and it supports ProRes video. The durability rating and the storage options of these two phones are the same, as are the display qualities.

The main advantage of the Duo over the iPhone 18 Pro Max is that its inner screen is larger than the screen of the Pro Max — the Pro Max boasts a 6.9-inch display while the Duo’s inner screen sits at 7.6 in. With this bigger screen, the Duo might be better for tablet-like use when multitasking or gaming, but otherwise, it’s too similar (and with some specs, too inferior) to the iPhone 18 Pro Max to warrant the much higher price.

If you think the Pro Max might be the right choice for you, check out our iPhone 18 Pro Max review for more details.

Phone Duo vs Samsung Galaxy Z Fold: Which is better?

The differences between Apple’s first foldable and Samsung’s latest Galaxy Z Fold 8 are a little more nuanced. The Z Fold 8 wins out in thinness and multitasking, supporting up to three apps at the same time compared to the Duo’s two apps, but when closed, the iPhone Duo’s passport shape feels more comfortable to use with one hand or store in a pocket.

The Galaxy Z Fold 8’s cameras also win out over the iPhone Duo’s. The Z Fold 8 boasts a rear dual-lens setup with 50MP for each lens, just slightly beating the Duo’s 48MP. The Z Fold 8 Ultra, however, kicks things up a notch if you’re interested in the premium model: its rear triple-lens with a 200MP main sensor blows the Duo’s 48MP dual sensors out of the water. In addition, the Z Fold 8 is slightly cheaper than the iPhone Duo, while the two phones’ battery life is likely to be fairly comparable during real-world use.

If foldable photography is a priority for you, we recommend the Z Fold 8, but if you’re an Apple ecosystem die-hard, the iPhone Duo may be the better choice, even with its higher price and a few inferior features.

iPhone Duo vs Google Pixel Fold: Which is better?

Perhaps the main difference between the iPhone Duo and the Google foldables is the design. When closed, the Google Pixel Fold feels much more like a regular slab phone, while the iPhone Duo is more compact. This is purely a personal preference, but it does mean that the Google Pixel’s inner display is larger than that of the iPhone Duo.

However, both brands’ foldables support up to two apps at a time, but Google’s battery life falls a little shorter than the iPhone Duo’s, at up to 24 hours of use. The camera on the Pixel, though, is admittedly better, with a triple-lens setup in the back and a dedicated telephoto lens. The launch price of the Pixel is also slightly lower than that of the iPhone Duo.

Use cases: Is the iPhone Duo worth buying?

Whether the iPhone Duo is worth buying depends heavily on how you typically use your smart phone and what your budget and priorities are. Think about the following ways to use a smartphone to make a better decision.

Who should not buy the iPhone Duo?

At a high launch price of $1,999, the iPhone Duo certainly isn’t for everyone. If you value having the latest tech as soon as you can, you’re a foldable enthusiast and have been holding off simply because you’re also an Apple enthusiast, or you’re looking for a phone that can double as a tablet, the iPhone Duo may be for you. However, there are plenty of people who we think should NOT buy the iPhone Duo — at least, not yet. Skip the iPhone Duo if…

• You already own a recent iPhone Pro model

• You already have a recent iPad model

• You primarily use your phone for photography

• You’re on a tight budget

• You only use your smartphone for basic tasks like messaging and calling

• You prefer tried and true reliability over novelty

How can I save money on an iPhone Duo?

✨The best way to save money on an iPhone Duo is to wait for it to hit the refurbished market.

There are always plenty of ways to get your hands on more affordable tech, including the new iPhone Duo. The first option is to wait for sales events like Black Friday and Cyber Monday, when many retailers offer discounts on their tech. Or, you could bundle your iPhone Duo with other accessories like an Apple Watch, AirPods, or chargers to reduce the price of the whole package.

The best way to save money on an iPhone Duo, though, is to wait for them to become available on the refurbished market. Back Market offers premium tech for up to 50% off the price of new all year round; after all, the best time to buy a refurbished iPhone is when you actually need one. Each device on our pages also comes with a 1-year warranty and a 30-day money-back guarantee for added confidence. This is especially useful for first-gen phones like the Duo, allowing you to try them out for a period of time with a lower financial commitment.

Is a refurbished iPhone Duo worth it?

“Perfect condition and great experience!

My daughter ordered an iPhone 13 from Back Market, and it arrived in perfect condition. The phone works flawlessly, and the entire buying process was smooth. We are highly satisfied and would definitely recommend Back Market for refurbished technology! Thank you 😊” — Back Market customer Jamarcuss J.

Yes, the new iPhone Duo price alone makes a refurbished model worth it, considering it can come at up to 50% off the $1,999 launch price. If you’re wondering what a refurbished iPhone is, it’s not just any old “used” iPhone. Each device you see on our sale pages has been inspected, cleaned, repaired when necessary, and tested to ensure it performs up to its original benchmarks, and the same will go for the iPhone Duo once it becomes available. This means you’re getting a reliable, functional piece of new tech for much less than its original launch price, and we grade each item’s condition, so you know exactly what you’re getting.

Not only is buying refurbished good for your wallet, but it’s also good for the planet. When you purchase a refurbished smartphone, you reduce the need for new manufacturing and support a circular economy, keeping old tech from ending up in landfills as e-waste.

Trade in your old tech

Another way to offset the cost of an iPhone Duo is to trade in your old tech at Back Market. All you have to do is follow three simple steps:

1. Fill out a short online form with details about your device and receive a quote from us.

2. If you accept the quote, pack up your device and ship it to us for free.

3. Once it’s verified, you get paid, either in credit towards your next Back Market purchase or in cash back in your bank account.

It’s really that easy.

iPhone Duo price and availability

iPhone Duo review final thoughts: Is it worth it?

In our opinion, buying the iPhone Duo new is not worth it for most users, but the choice depends heavily on your budget and your needs and priorities. If you want a phone that can double as a tablet for multitasking, gaming, and streaming content, the iPhone Duo may be for you. It may also be worth it if you’re a foldable enthusiast but you’re already integrated into the Apple ecosystem — then, this may be the opportunity you’ve been waiting for.

However, the high launch price isn’t worth it for many users. Those who already have a tablet or a recent iPhone Pro model, prioritize iPhone photography, or only use their phones for basic tasks may find that the iPhone Duo is just expensive overkill. Photographers will find better-quality cameras on the iPhone 18 Pro models, while those using their smartphones for basic tasks may want to read our iPhone 17 review as this model could provide better value. The Duo is also not worth it for those on a tighter budget; an older iPhone model paired with a cheaper tablet may do the trick instead.

While this phone is indeed an impressive first foldable for the legendary brand, it’s generally not worth buying right away.