iPhone Duo Issues: Camera Quality, App Support and Hinge Wear

The iPhone Duo’s biggest trade-off is already clear: its foldable display opens up new ways to use the phone, but the experience depends on software and hardware that are still settling in. After more than a week using the Duo as a primary phone, the reviewer hadn’t found a problem serious enough to switch back to another iPhone. That doesn’t make the complaints imaginary. The inner selfie camera is weak, app support is uneven, early bugs have appeared, and nobody yet knows how the hinge will hold up over years of use.

Apple said it was aware of an issue affecting the inner display on a small number of iPhone Duo units. Its advice to affected owners was to contact AppleCare for a replacement. The statement doesn’t establish how widespread the issue is, but it makes clear that reports of display trouble shouldn’t be dismissed as speculation.

The phone was available for pre-order while broader availability was still limited, a period when individual problems can attract more attention than they might after a product has been in regular use for months. The practical question is which complaints reflect lasting limitations and which might improve with software updates and developer work.

The inner camera works best for calls

The Duo has four cameras: 48-megapixel main and ultra-wide cameras on the back, a 12-megapixel selfie camera in the outer display, and a 4-megapixel camera beneath the inner display. That last camera is the one that draws criticism, and the reviewer’s experience supports it. For still photos, its low resolution leaves Apple’s image processing trying to fill in the gaps. Results can look smooth and artificial, with a smudged or plasticky finish.

For video calls, a camera tucked into the large inner screen has an obvious convenience. For selfies, the same placement creates a trap: opening the phone and seeing yourself on a generous viewfinder makes the inner camera feel like the natural choice, even though it produces the weakest photos.

There are better options. The 12-megapixel outer selfie camera is serviceable, though it falls short of the 18-megapixel selfie cameras on other recent iPhones. The strongest results come from the rear cameras. Taking that route means unfolding the phone, opening the camera, turning the device around and using the display as a viewfinder. A case may get in the way, too. It’s an awkward process for a quick shot, but the reviewer says the main cameras can produce better selfies than other iPhones, including Pro models.

That leaves a clear distinction: use the inner camera for calls, and choose another camera for photos when image quality matters.

App layouts depend on developer updates

Apps built or updated for the Duo’s inner screen can make good use of the extra space. Others simply run there without a layout designed for the larger display. In the more awkward cases, an app appears in a small iPhone-sized window; enlarging it can make the interface blurry.

The reviewer saw that pattern in Google apps including Gmail, Google Calendar and Google Drive, as well as TradingView and PlugShare. Banking apps may also lag behind, since local providers may not have adapted their software yet. The result is an inconsistent experience: a well-fitted app such as Netflix can sit alongside one that looks undersized or poorly scaled.

This is a compatibility issue that depends largely on third-party developers. The reviewer expected many popular apps to add Duo-ready layouts, and reported that at least 10 frequently used apps had been updated between receiving the phone and writing the review. That early progress is encouraging, though it doesn’t guarantee that every app will get an update or that less popular services will prioritize the device.

For buyers, the useful check is their own app mix. If work or daily routines depend on an app that currently sits in a small window, the large inner display may not improve that part of the experience yet. App support should become easier to judge as updates arrive.

Early bugs and fold-related missteps

Some initial software problems appeared specific to the Duo. WhatsApp sometimes misread camera orientation during video calls and QR-code scans. The reviewer said that issue appeared fixed by publication. Apple’s own software also occasionally displayed content in the wrong orientation.

There’s another source of confusion that isn’t a conventional software bug. While folding or unfolding the phone, it’s easy to touch the screen and trigger an action without realizing it. The app may then behave unexpectedly, leaving the user to work out what changed. Foldables create more chances for accidental contact because using the device involves changing its shape and grip.

The reviewer expected Apple to address the software faults, but early fixes don’t prove that every problem is resolved. Anyone sensitive to launch-period bugs could wait a month or two and see how the experience develops. Limited availability may mean some buyers will be waiting regardless.

Hinge life is still an open question

Out of the box, the hinge felt smooth. The crease across the inner display could be felt, but was difficult to see in ordinary use. Under direct light and at a particular angle, it became more visible. That gap between a close-up photo and normal viewing is central to interpreting the images circulating online.

YouTuber Tim Pan tested a Duo in a folding machine, cycling it 10,000 times and then another 1,000 times at minus 4 degrees Fahrenheit. Images comparing the crease before and after the test spread online and appeared to show a pronounced change. In the video, Pan said the hinge remained “very smooth” afterward. The reviewer cautioned that a dramatic-looking crease in a photograph doesn’t necessarily match what a person sees while using the phone.

The test offers a data point about repeated folding, but it can’t answer how an individual Duo will look or feel after one, two or three years. The reviewer hadn’t performed anything close to that many folds, and a machine test doesn’t settle how normal use affects every unit. Foldable phone buyers should expect some wear over time and decide how much a visible crease would bother them.

The Duo’s near-term weaknesses have different prospects: app layouts and software faults can improve through updates, while the inner camera is a hardware limitation users have to work around. Hinge durability and the reported inner-display issue need more real-world experience. For now, the strongest reason to choose the Duo is the foldable format itself; buyers should weigh that against uneven app support and uncertain long-term wear.

Apple’s response, added Oct. 26, 2026, said owners experiencing inner-display issues should contact AppleCare for a replacement.