Answer in brief
iPhone Duo is Apple's first foldable iPhone. It starts at $1,999 with 256GB and costs $3,199 with 2TB, takes preorders from October 16 and ships on October 23 in more than 70 countries and regions. It unfolds from a 5.4-inch phone into a 7.6-inch display, runs A20 Pro and adds two-app Split View.
Price: $1,999 to start and $3,199 for 2TB
iPhone Duo is the first foldable iPhone, and Apple priced it accordingly. In the United States it starts at $1,999 with 256GB of storage and rises to $3,199 for the 2TB version, with 512GB and 1TB options in between. Apple also offers it for $83.29 a month over 24 months in the US. The two finishes are star white and night sky.
That puts the Duo $700 above the $1,299 iPhone 18 Pro Max and $800 above the $1,199 iPhone 18 Pro, both announced at the same September 9 event. The gap is the real comparison for most buyers: not whether a foldable is exciting, but whether one device that unfolds is worth more than a conventional flagship plus the tablet or laptop many people already carry.
The Associated Press described the Duo as the biggest change to the iPhone in its nearly 20-year history, and Apple's new chief executive John Ternus used it to anchor his first keynote. Big launches tend to drown out practical questions, so the rest of this guide focuses on what the specifications settle and what they leave open.
Release dates: October 16 preorders, October 23 availability
Unlike the Pro phones, which reach stores on September 18, the Duo follows a later calendar. Preorders open on Friday, October 16, and availability begins on Friday, October 23, in more than 70 countries and regions. A second wave of 28 additional countries follows on Friday, October 30.
The gap gives undecided buyers a month to handle the Pro models in stores, read early hands-on impressions and wait for full reviews before committing to a phone that costs as much as a high-end laptop.
It also means launch-day stock will be the first real test of demand. Apple has not published production figures, so any claim about shortages or delivery delays before October 16 is speculation rather than reporting.
Two screens: 5.4 inches closed, 7.6 inches open
Closed, the Duo is a 5.4-inch phone with a Super Retina XDR display on the outside. It opens like a book into a 7.6-inch Super Retina XDR panel that Apple calls the largest display it has put in an iPhone.
The crease is the question every foldable buyer asks. Apple says a nano-texture finish on the inner screen reduces glare and minimizes how visible the fold line is. That is a claim about appearance under normal viewing, not a promise that the crease is gone, and it can only be judged in person and after months of opening and closing.
The outer screen matters as much as the inner one. If the closed phone feels cramped for messages and quick replies, owners will open it constantly, which puts more wear on the hinge and more demand on the battery. Reviews that report how often testers actually unfolded the phone will say more than screen measurements alone.
Split View and the case for a bigger canvas
Software is what turns the larger screen into something more than a stretched phone. Opened, the Duo supports Split View with two apps side by side, two windows of the same app, saved pairs of apps that reopen together, and Siri working alongside another app.
That combination is aimed at people who already juggle a phone and a tablet: a document next to a browser, a chat next to a calendar, a map next to a booking confirmation. For them, the Duo can remove a device from the bag. For people who rarely use two apps at once, the extra screen is mostly a bigger way to watch video.
Third-party apps will decide how good the experience feels after the first week. Apple's own apps are ready at launch, but banking, messaging and work apps need updates to use the extra space well, and that adoption takes time.
A20 Pro, a custom vapor chamber and two batteries
Inside, the Duo uses the same A20 Pro chip as the iPhone 18 Pro, with a seven-core GPU. Apple pairs it with a custom vapor chamber and claims up to 35 percent better sustained performance than iPhone 17 Pro, a figure produced in Apple's own tests.
Instead of one large cell, the Duo has a battery on each side of the fold, managed as a single system. Apple's estimates are up to 31 hours of video playback on the inner screen, up to 44 hours on the outer screen and up to 24 hours of mixed use.
The mixed-use figure is the one to watch, because people buy a foldable to open it. A day spent mostly on the outer display will look far better than a day of maps, documents and video on the big screen, so read the battery claims against how you expect to use the phone.
Cameras built around the fold
The rear system pairs a 48MP Fusion main camera, which also provides a 2x telephoto view, with a 48MP Fusion Ultra Wide camera. On the inside, a Center Stage front camera is designed to adjust the framing automatically during calls.
The fold creates capture options a slab phone cannot offer. You can use the rear cameras for selfies while framing yourself on the outer display, and Apple's Duo Preview shows the person being photographed a live view of the shot. Apple also introduces Smart Take, which uses scene analysis to help catch the moment.
Photography-first buyers should still compare the two camera systems side by side before assuming the more expensive phone includes every Pro camera feature. The Duo has two rear cameras, and its pitch is about new ways to frame and share shots rather than a larger camera array.
What the launch does not answer yet
Three expensive questions remain open. The first is durability: Apple says the hinge uses more than 100 components, but only months of daily folding will show how it and the inner screen age. The second is repair cost if the flexible display is damaged. The third is how the two batteries hold up after a year of heavy inner-screen use.
There are practical details to check too. The Duo is eSIM-only worldwide, so travelers who swap physical SIM cards abroad need a plan, and unlocking uses Touch ID in the side button, with Apple Watch unlock as an alternative.
None of these are reasons to dismiss the phone. They are the price first-generation buyers pay for being early, and they are exactly what long-term reviews should measure before cautious buyers commit.
Who should preorder the Duo and who should buy a Pro
The strongest audience is someone who regularly carries both a phone and a small tablet, works across two apps at once and travels often enough that one fewer device matters. For that person, the premium buys a genuinely different way of working.
The weakest audience is the buyer who simply wants the most expensive iPhone. Expensive is not the same as best for everyone: the iPhone 18 Pro and Pro Max cost less, keep a familiar shape and arrive a month earlier.
If you are undecided, use the weeks between September 18 and October 16 well. Try the Pro models in a store, decide how often you would really open a larger screen, and read the first detailed Duo reviews before preorders open.
Practical checklist
- Decide whether you will open the phone every day, because the case for the Duo rests on the inner screen, not the outer one.
- Compare the Duo with an iPhone 18 Pro Max plus a tablet you already own before paying first-generation pricing.
- Check the price of the exact storage tier in your country before budgeting around the $1,999 starting price.
- Confirm that your carrier supports eSIM, since the Duo does not take a physical SIM card anywhere.
- Wait for long-term reviews if hinge wear, crease visibility or repair costs would change your decision.
Questions and answers
How much does the iPhone Duo cost?
In the United States it starts at $1,999 with 256GB of storage, and the 2TB version costs $3,199. Local prices vary with taxes and currency.
When is the iPhone Duo release date?
Preorders open on Friday, October 16, 2026, and availability begins on Friday, October 23, in more than 70 countries and regions. A second group of 28 countries follows on October 30.
How big are the iPhone Duo screens?
The outer display measures 5.4 inches and the inner folding display 7.6 inches. Apple says a nano-texture finish on the inner screen reduces glare and makes the crease less visible.
How do you unlock the iPhone Duo?
Apple lists Touch ID built into the side button, and the phone can also be unlocked with an Apple Watch. Check how that fits your routine if you are used to Face ID.
Should I buy the iPhone Duo or an iPhone 18 Pro?
Choose the Duo if a larger screen for two apps would replace a tablet in your routine. Choose the 18 Pro for a lower price and a conventional shape, and compare both camera systems if photography is your priority.