Apple's first foldable iPhone is a shipping product, not a rumor. The phone is sold as the iPhone Duo, it appears as a new item on Apple's US store described as "The largest display of any iPhone. Foldable. Posable. And durable," and it starts at $1999 with four storage tiers: 256GB, 512GB, 1TB, and 2TB [2][5]. The core answer to what you get for that price: a 7.6-inch inner folding OLED screen with a 5.4-inch outer display, a titanium foldable body with a 3D-printed titanium hinge cover, Apple's A20 Pro chip, and iOS 27 [2]. One practical caveat matters before any purchase decision: units bought in the US or Puerto Rico have no physical SIM tray and activate only via eSIM [5].
A note on scope: this article covers the iPhone Duo's official specifications, dimensions, and US pricing. Samsung Galaxy Z Fold series specifications and pricing were not available from official sources in the verified material, so no head-to-head table or "which should you buy" verdict appears here — that conclusion needs both sides' official numbers. What follows is what Apple's own pages confirm, and what it means for a potential buyer.
The displays: Apple's largest iPhone screen, inside and out
The headline feature is real and quantified. The inner display is a 7.6-inch (diagonal) all-screen OLED folding panel at 1878×2670 resolution and 430 ppi, with a nano-texture matte finish [2]. The outer display is a 5.4-inch Super Retina XDR OLED at 1398×2034 and 460 ppi [2]. Both displays support ProMotion adaptive refresh rates up to 120Hz, Dynamic Island, and Always-On [2].
The nano-texture matte coating on the inner panel is a deliberate choice for a main screen that gets handled constantly and viewed at many angles, where glare control matters more than on a slab phone. It also marks the first time an iPhone uses a folding OLED panel at all, which makes this the largest display ever fitted to an iPhone — a claim Apple states directly in its store copy [5]. For context from Apple's current lineup, the slab-style iPhone 17 carries a 6.3-inch Super Retina XDR display at 2622×1206 and 460 ppi [3], and the ultraportable iPhone Air sits at 6.5 inches [1]. The Duo's 7.6-inch inner panel is in a different size class entirely, and the 5.4-inch outer screen alone is close to the iPhone 17's full display [2][3].
Dimensions and the hinge: 5.2mm open, 11.3mm closed, 254 grams
The official measurements show a book-style fold. Open, the phone measures 164.6mm wide, 117.8mm tall, and 5.2mm thick. Closed, it measures 84.1mm wide, 117.8mm tall, and 11.3mm thick, and it weighs 254 grams in either state [2].
Those numbers describe a phone that, when closed, is roughly the width of a conventional iPhone but thicker and heavier. The 254-gram weight sits well above the 177-gram iPhone 17 [3] and far above the 165-gram iPhone Air [1]. That is the standard trade of the foldable form factor: pocketable width and a tablet-class screen when open, at the cost of thickness and mass. Whether the trade suits you depends on whether you will actually use the inner screen often enough to carry the extra weight every day.
On the hinge itself, Apple confirms a titanium foldable design with a hinge cover that is 3D-printed from 100% recycled titanium, Ceramic Shield 2 on the front, and Ceramic Shield on the back [2]. Authentication is via Touch ID built into the side button rather than Face ID — a workable choice for a device whose front camera orientation changes between folded and open states, and a visible departure from the slab iPhone's setup, where the iPhone 17 uses Face ID enabled by TrueDepth technology in the front camera [2][3].
One gap worth stating plainly: Apple's published specifications do not include crease treatment details or open/close cycle durability data. For a first-generation folding iPhone, hinge longevity is exactly the information a buyer would want, and it is not in the official material at this point.
Performance and battery: A20 Pro, iOS 27, and a meaningful two-screen battery gap
The iPhone Duo runs the A20 Pro chip — a 6-core CPU with two super cores and four efficiency cores, a 7-core GPU with Neural Accelerators, and a dual 16-core Neural Engine — on iOS 27 [2]. That is the same chip Apple lists for its iPhone 18 Pro models, which also use a 7-core GPU with Neural Accelerators [1], so the foldable is not a detuned flagship. The slab iPhone 17, by comparison, runs the A19 chip with a 6-core CPU and 5-core GPU [3].
Battery figures reveal the cost of the big inner screen. Apple rates video playback at up to 44 hours using the outer display and up to 31 hours using the inner display [2]. The 13-hour spread between the two screens is large, and it should shape expectations: if your typical usage keeps the phone folded, you get close to the best battery rating Apple has quoted on any iPhone; if you live on the unfolded 7.6-inch screen, plan around roughly 70% of that figure. For reference, the iPhone 17 is rated at up to 30 hours of video playback [3]. These are Apple's laboratory ratings, and actual results vary with network configuration and usage conditions.
What to know before buying: eSIM-only in the US, AppleCare coverage confirmed
Two purchasing facts follow directly from Apple's official pages.
First, regional connectivity. Apple states that iPhone Duo models purchased in the US or Puerto Rico have no physical SIM tray and activate only using eSIM [5]. Activation outside the country works only if your carrier supports eSIM, or via a travel eSIM at your destination [5]. This is stricter than the slab iPhone 17 sold in some markets, which supports dual SIM via nano-SIM and eSIM [3] — meaning a US-unit Duo limits the practical resale and travel flexibility compared with iPhone models that keep a physical SIM option.
Second, service coverage. The iPhone Duo is listed as its own model in AppleCare's coverage lineup, alongside the iPhone 17e, iPhone 17, iPhone 16, iPhone Air, and iPhone 18 Pro models [4]. That confirms Apple's standard extended warranty and support path applies to the foldable from day one — relevant for anyone weighing repair risk on a first-generation hinge.
Pricing position and the open question
At $1999 for 256GB in the US, the iPhone Duo enters at the highest starting price of any current iPhone, a tier that sits alongside the iPhone 18 Pro line in Apple's store [5]. The 256GB base and the 2TB ceiling give it a wider storage range than most of the lineup, which matters for a device positioned partly as a media and productivity device.
The defensible bottom line: Apple has shipped a foldable with the largest iPhone display ever made, a genuine tablet-class 7.6-inch inner screen, flagship-class silicon, and full official store and AppleCare support, at a $1999 US entry price [2][4][5]. Whether it is the right foldable against Samsung's Galaxy Z Fold series cannot be answered from this material — Samsung's official specifications and pricing were not available to verify, and any comparison built without them would be guesswork. If you are considering the Duo on its own merits, the two open items to watch are hinge durability data (not yet published) and official pricing in your own market (only US pricing is confirmed here).