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| The Apple iPhone Duo fails to fully impress in tests. |
The tech world has finally gotten its hands on Apple's most ambitious iPhone yet. After a week of testing, reviews for the iPhone Duo are flooding in, and the consensus is clear: Apple's first foldable is a remarkable piece of engineering that's not without its compromises.
The iPhone Duo officially ships this Friday, but critics from 9to5Mac, The Verge, PetaPixel, and prominent YouTubers like Marques Brownlee and Joanna Stern have already shared their detailed impressions. The verdict? A solid foldable with excellent build quality that nonetheless suffers from the typical issues plaguing first-generation products.
Design and Hinge: Apple's Engineering Prowess Shines
Perhaps the most universally praised aspect of the iPhone Duo is its hinge mechanism. Joanna Stern of The Wall Street Journal put the device through a grueling stress test, folding and unfolding it over 32,000 times using a specialized machine. The result? No problems whatsoever, though the hinge did offer slightly more resistance afterward.
9to5Mac's detailed review heaped praise on the hinge's construction, noting it comprises more than 100 individual components with a variable torque system that adjusts resistance as you open and close the device. The integrated magnet system keeps both halves securely closed when folded.
"The hinge feels fantastic," the 9to5Mac review noted, adding that after just a day of use, the novelty of folding an iPhone wore off in the best possible way. The device can also hold steady at various angles, enabling "seated" and "tent" configurations for hands-free video watching or FaceTime calls.
The iPhone Duo features a Grade 5 titanium frame with a polished, mirror-like finish and is available in Night Sky and Star White colorways. It carries an IP68 rating for dust and water resistance, matching every other iPhone Apple currently sells.
The Display: Nano-Texture Magic and a Manageable Crease
One of the standout features according to multiple reviewers is the matte nano-texture main display. According to Notebookcheck, Joanna Stern praised this display for offering significantly better sunlight readability compared to the Samsung Galaxy Z Fold8.
The crease situation has also received surprisingly positive feedback. While it's not invisible—despite what Apple's marketing might suggest—reviewers agree it's nowhere near as visible as on Samsung's foldables. 9to5Mac explained that Apple uses a nano-textured polymer layer that diffuses reflected light, preventing the mirror-like reflections that typically make creases more noticeable.
According to 9to5Mac: "Anyone who says the iPhone Duo's crease is invisible is misleading you. At the same time, anyone who says the iPhone Duo's crease is visible enough to be a problem is similarly misleading you."
The 7.6-inch inner display unfolds to reveal what's essentially an iPad mini experience, with a wider 1.4:1 aspect ratio that reviewers found more appealing than the taller, squarer shape of competing foldables.
Where the iPhone Duo Falls Short
Despite the praise, reviewers identified several significant shortcomings. The PetaPixel review titled "The iPhone Duo is a Compromise" captures the sentiment that Apple's first foldable makes trade-offs that may not sit well with everyone.
The camera system has drawn particular criticism. The lack of a telephoto camera and a merely mediocre dual-camera setup left reviewers wanting more, especially given the device's premium price point. The under-display camera also doesn't deliver good image quality, with Notebookcheck noting that in backlit conditions or low light, users should fold the phone shut and use the punch-hole front camera instead.
Thermals are another concern. The iPhone Duo reportedly gets very hot under sustained load, whether from extended camera use or gaming sessions.
The Verge's review described the device as "a messy, expensive, good time," calling it "one of Apple's messiest first-generation products in a long time." The review highlighted that the cover display is too small for some tasks, and the device is heavier and bulkier than a standard phone.
Software: iOS 27 Adapts to the Fold
The iPhone Duo runs iOS 27 with significant modifications to accommodate its unique form factor. According to 9to5Mac, navigation controls have moved from the bottom to the right side of the interface, with the dock also relocated to the right-hand side. The interface is adaptable—when used unfolded in portrait orientation, controls shift back to the bottom like standard iOS.
Split View makes its iPhone debut with the Duo, allowing two apps side by side or two windows from the same app. This has proven to be a productivity boost for reviewers, who appreciated being able to run Safari alongside Notes or Mail with a proper two-pane interface.
However, third-party app optimization remains a work in progress. Apps built with older SDKs display with black bars or run in a floating window, while apps built with the iOS 27.1 SDK or later can take full advantage of both displays. Developers have been quick to roll out optimizations, but the experience varies significantly depending on the app.
Touch ID Returns, Face ID Departs
In a significant departure from recent flagship iPhones, the iPhone Duo uses Touch ID integrated into the side button rather than Face ID. While Touch ID works quickly and reliably, reviewers found the adjustment period challenging after years of Face ID convenience.
The trade-off means no Attention Aware features—your iPhone won't check for your attention before dimming the display or expanding notifications. Apple Watch unlock helps mitigate this, but it's clear Face ID will likely return in future generations.
The Verdict: A Promising First Chapter
Marques Brownlee's review, titled "First Generation Fun!" with over 3.8 million views, captures the excitement and caution surrounding Apple's foldable debut. The iPhone Duo represents the biggest change to the iPhone's form factor in nearly 20 years, and while it's not perfect, it's a fascinating glimpse into the future.
At $1,999, the iPhone Duo is undeniably expensive. The Verge called it "an early adopter special" that will "delight gadget nerds and early adopters and likely frustrate everyone else."
For those willing to embrace the compromises—the weight, the heat, the camera limitations, and the app optimization growing pains—the iPhone Duo offers something genuinely new from Apple. The question is whether that novelty is worth the premium, or whether waiting for the inevitable second-generation improvements makes more sense.
The iPhone Duo ships Friday, October 23rd. Pre-orders are available now on Amazon for those ready to experience Apple's foldable future firsthand.