Apple has officially entered the foldable phone market with the iPhone Duo, its first iPhone designed around a folding display.

Unveiled on September 9, 2026, the iPhone Duo represents one of the biggest changes to the physical design of the iPhone since the original model launched. Rather than simply making the screen larger, Apple has created a device that works like a conventional smartphone when closed but opens into a much larger tablet-style display.

Here are the biggest iPhone Duo features and what they could mean for anyone considering Apple’s new foldable iPhone.

What is the iPhone Duo?

The iPhone Duo is Apple’s first foldable smartphone.

It uses a book-style design similar in principle to devices such as Samsung’s Galaxy Z Fold range. When closed, users have access to an external touchscreen that can be used like a normal iPhone.

Open the device and a much larger display appears inside.

The design means Apple can offer something approaching an iPad mini-style experience without requiring users to carry a separate tablet.

Foldable smartphones have existed for years, but Apple has taken considerably longer than competitors such as Samsung and Google to enter the category. The iPhone Duo is therefore a significant new product category for Apple rather than simply another annual iPhone update.

A huge 7.6-inch foldable display

The biggest iPhone Duo feature is naturally its display.

When closed, the phone has an approximately 5.4-inch external screen. Opening the iPhone Duo reveals a 7.6-inch internal display, making it the largest screen Apple has ever fitted to an iPhone.

The larger display should make the iPhone Duo particularly useful for:

  • Watching YouTube, Netflix and other video services
  • Reading websites and ebooks
  • Editing photos
  • Working with documents
  • Gaming
  • Email
  • Video calls
  • Running multiple apps simultaneously

Rather than simply giving users a bigger version of the normal iPhone interface, the larger screen gives Apple an opportunity to blur the line between iOS and the sort of multitasking normally associated with an iPad.

Proper multitasking on an iPhone

One of the most interesting elements of the iPhone Duo is its focus on multitasking.

The large internal display can show apps side-by-side, allowing users to work with more than one application simultaneously. Apple is effectively turning the iPhone into a small productivity device when it is unfolded.

You could potentially have Safari open while writing an email, view Messages alongside Maps, or watch a video while browsing another app.

This might ultimately become one of the biggest reasons to buy an iPhone Duo rather than an iPhone Pro Max.

A larger screen is useful, but being able to actually use that extra space intelligently is what could make the foldable design worthwhile.

Apple Pencil support comes to the iPhone

Another major change is support for the Apple Pencil.

Apple has traditionally restricted Apple Pencil support to the iPad, despite years of speculation that the accessory could eventually work with an iPhone.

The iPhone Duo finally changes that.

Apple Pencil support means the unfolded display can be used for handwritten notes, drawing, document annotation and more precise interaction with apps.

For creative users in particular, this makes the iPhone Duo much closer to carrying a small iPad in your pocket.

It could also make the device particularly attractive to designers, students and business users who already use an Apple Pencil with an iPad.

A20 Pro processor

The iPhone Duo is powered by Apple’s new A20 Pro processor, according to launch reports.

The chip is designed not only to provide faster CPU and graphics performance but also to support Apple’s growing number of on-device AI features.

That additional power will be particularly important on a foldable device.

Running several apps simultaneously, driving a much larger display and handling increasingly sophisticated AI functions will require considerably more processing power than many traditional smartphone tasks.

Touch ID makes a return

One particularly interesting design decision is the return of Touch ID.

Rather than relying entirely on Face ID, reports from Apple’s launch say the iPhone Duo integrates Touch ID into its side power button.

Apple has already used a similar system on several iPad models.

The approach makes sense on a foldable phone because the device can be used in several different positions, while a side-mounted fingerprint reader remains accessible whether the phone is open or closed.

It also means the iPhone Duo becomes one of the most unusual modern iPhones by bringing fingerprint authentication back to Apple’s flagship smartphone range.

Dual 48-megapixel rear cameras

Apple has equipped the iPhone Duo with two 48-megapixel rear cameras, according to reports around the launch.

The foldable design inevitably requires Apple to make compromises around internal space, so the camera system is not necessarily intended to replace the most advanced iPhone Pro camera setup.

That means buyers choosing between an iPhone Duo and an iPhone 18 Pro Max may face an interesting decision.

The Pro models remain focused heavily on photography, while the Duo prioritises screen size, productivity and the folding form factor.

Titanium construction and improved durability

Durability has always been one of the biggest questions surrounding foldable phones.

Apple appears to have focused heavily on this area with the iPhone Duo.

The device uses a titanium frame alongside Ceramic Shield protection and is reported to offer IP68 dust and water resistance.

That is particularly important because folding phones contain considerably more moving components than conventional smartphones.

For Apple, convincing existing iPhone owners that a folding display can survive years of everyday use may be almost as important as the display itself.

How much does the iPhone Duo cost?

The iPhone Duo sits firmly at the premium end of Apple’s product range.

Reports around the launch put the starting US price at approximately $2,000 for a model with 256GB of storage, potentially making it the most expensive mainstream iPhone Apple has produced. Higher-capacity versions are expected to cost considerably more.

Availability is expected to follow later than Apple’s conventional iPhone 18 Pro models, with shipments reportedly beginning as early as October 2026.

Pricing and exact release dates may vary by country.

Is the iPhone Duo the future of the iPhone?

The iPhone Duo is unlikely to replace the traditional iPhone immediately.

Foldable smartphones still represent a relatively small part of the global smartphone market. In 2025, foldable devices accounted for only around 1.6% of smartphone sales.

But Apple entering the category could change that.

The important thing about the iPhone Duo isn’t simply that the screen folds.

It allows one device to perform two very different jobs.

Closed, it behaves like an iPhone.

Open, it becomes something closer to a miniature iPad.

Add Apple Pencil support, multitasking and Apple’s latest processor, and the iPhone Duo starts to look less like a folding gimmick and more like Apple’s attempt to create an entirely new kind of mobile device.

For people who already carry both an iPhone and an iPad, that might be the most interesting feature of all.