Apple's $1,999 iPhone Duo: First 2nm Phone Chip, Foldable Compromises

Apple's first foldable, the iPhone Duo, starts at $1,999 and ships with the A20 Pro, the company's first 2nm phone chip, delivering roughly 20 to 30 percent better single- and multi-core CPU performance than the A19 Pro, according to benchmarks that land in the ballpark of Apple's published figures. Ars Technica reviewer Andrew Cunningham tested the device for nearly a week. His verdict: technically impressive, but not always enjoyable, and weaker than a regular iPhone in most one-handed use.

The A20 Pro is Apple's second 2nm chip overall, after the M6 that debuted in the new Mac mini. It pairs two large "super" CPU cores with four efficiency cores, dropping the performance cores entirely; the M6 ships all three core types. The GPU climbs to 7 cores, up from 5 to 6 in the A19 Pro, alongside an upgraded 32-core Neural Engine. Benchmarks showed 40 to 50 percent faster GPU performance, with a 73 percent score on 3DMark Wild Life Extreme flagged as an outlier. RAM holds steady at 12GB.

What changes with the fold?

The Duo's 5.4-inch outer screen unfolds into a 7.6-inch inner display, not far from the iPad mini's 8.5-inch panel. Apple has nearly engineered away the crease. Cunningham wrote that the company has "wrangled the between-screen crease so close to invisibility that I rarely thought about it." The inner display uses a matte nano-texture finish with different materials and a different pattern than the Mac and iPad version, Apple says, because the surface must fold. A raised rim keeps dust from grinding into the screen, and the cover layer can be replaced if damaged.

The compromises are structural. There is no Face ID; Touch ID moved to the power button, iPad-style. There is no Action Button, only a Camera Control button. Volume buttons sit on the top edge in folded mode and behave differently between portrait and landscape. The dock relocates to the right edge of the outer screen, limited to four icons amid what Cunningham calls too much negative space. The side-mounted controls "swim upstream against almost two decades of smartphone app design," and the iOS keyboard still shrinks the viewable area to a few lines of text.

The design is fundamentally right-aligned. Cunningham, who has large hands, found left-handed thumb reaches difficult to impossible; a left-handed tester found the phone extremely uncomfortable, particularly the stretch to the side-mounted dock. The titanium frame resembles last year's iPhone Air, which many observers, Cunningham included, had called a half-step toward a foldable.

How well does the inner screen work?

Unfolded, the Duo resembles what Cunningham calls an iPad Nano. It runs iOS, not iPadOS, with a new split-screen scheme similar to the iPad's old Split View: pin an app to one half, and the other half becomes a full iPhone home screen. Both apps run independently, even the same app twice. Closing the phone preserves the right-half session on the outer screen.

Third-party apps need updates to use the inner screen properly; apps targeting the Xcode 27.1 SDK get baseline support for free. Unupdated apps run as phone-sized windows with black borders when unfolded. Cunningham noted surprise at how many apps added support within days of launch, given Apple only released the tools weeks earlier, but he expects a long tail of incompatible software.

The device also supports intermediate states: a tent mode with StandBy views, a bent-tablet mode that treats the hinge as a dead zone, and a laptop mode held at nearly any hinge angle. A New York Times Cooking developer told Cunningham the Duo requires support for seven distinct app views.

The under-screen camera is a persistent flaw. It is visible almost constantly, and it captures noisier, over-sharpened images. Apple does not list its resolution, but its 2432 x 1824 output works out to about 4.4 megapixels, one-third the outer camera's 12MP, itself down from 18MP on other iPhones. The outer camera setup matches the basic iPhone: one 48MP main and one 48MP ultrawide sensor, each enabling 2x zoom by cropping a 12MP patch. There is no telephoto. Apple's spec page claims a "4x optical-quality zoom range" for the ultrawide, a description Cunningham calls hand-wavy. Low-light detail improves marginally over his iPhone 17 Pro, but digital 4x and 8x shots lose outright to the 17 Pro's telephoto.

Is the package worth $2,000?

The entry price exceeds two iPhone 17s and matches the cheapest MacBook Pro. Accessories add more: a $79 Duo Case, which attaches with adhesive and raises longevity concerns, and a $129 Folio with a magnetic kickstand. The Folio's cover puts the phone to sleep when closed, solving one ambiguity, but it blocks the camera and flashlight when folded back.

Cunningham draws a parallel to early-2010s convertible Windows PCs: designs like Surface and Yoga never matched purpose-built laptops or tablets at either role. The Duo, in his view, straddles the same line between iPhone and iPad. He likes it as a Kindle-sized iPad. As a phone, he sees no way he prefers it to a regular iPhone. Some users have reported screen breakage, though his review unit had no such issues, and he notes that a future version with Face ID would be close to the best this form factor allows, given battery and physics constraints.

Until then, the Duo asks buyers to accept degraded core iPhone features, a long app-compatibility tail, and a near-$2,000 entry price for hardware whose strongest virtue is that it mostly hides the seam.