iPhone Duo: this is Apple's first foldable iPhone

The iPhone Duo is Apple's first foldable iPhone. The housing folds open like a book, from a 5.4-inch outer screen to a 7.6-inch inner screen. Apple announced the iPhone Duo on September 9, 2026, alongside the iPhone 18 Pro; sales began on October 23, 2026. The most remarkable feature is the screen, which is only 5.2 millimeters thin when opened. Below is an overview of what the iPhone Duo is, what the foldable iPhone can do, and what it costs.

What is the iPhone Duo?

The iPhone Duo is a book-style device with two screens. The outer screen measures 5.4 inches, and the inner screen measures 7.6 inches when unfolded, featuring a nanotexture layer to reduce reflections. Both screens are OLED with ProMotion up to 120 Hz and a peak brightness of 3,000 nits. The name was long predicted to be iPhone Fold or iPhone Ultra, but Apple chose iPhone Duo. The device is available in two colors: Night Sky, a deep dark blue, and Star White. You can read more about the iPhone 18 colors in our color overview.

The screen and the hinge

The screen without a visible crease is the key feature of the iPhone Duo. Many foldable phones have a visible crease running down the middle. Apple uses optically clear adhesive layers that allow the screen layers to slide past each other during folding, which limits tension and thereby the crease. The hinge consists of more than one hundred parts and has a 3D-printed titanium cover. The frame is made of grade 5 titanium, while the front and back are finished with Ceramic Shield. This very crease held back the foldable iPhone for years: Apple was expected to launch around 2020, but waited until the crease was virtually invisible.

Specifications of the iPhone Duo

The specifications of the iPhone Duo center on a thin design with the dimensions of a small tablet. The overview:

Two cameras and Touch ID

The thin housing requires compromises. The iPhone Duo has two rear cameras: a 48MP Fusion main camera and a 48MP ultra-wide, with a 2x zoom mode derived from the main sensor. A separate telephoto lens is absent, as there is no room for it. On the outer screen is a 12MP Center Stage camera, and behind the inner screen is a camera that disappears completely under the display. For unlocking, the iPhone Duo uses Touch ID in the side button, because the Face ID system does not fit in the thin bezel. This makes the iPhone Duo the first new iPhone without Face ID since the 2022 iPhone SE. A physical SIM card does not fit either: the device works exclusively with eSIM worldwide.

What does the iPhone Duo cost?

The iPhone Duo costs 2,339 euros in the Netherlands for the 256 GB model. Prices rise to 2,589 euros for 512 GB, 3,089 euros for 1 TB, and 3,839 euros for 2 TB. In the United States, the device starts at 1,999 dollars, excluding sales tax. This makes the iPhone Duo the most expensive iPhone Apple has ever sold, more expensive than a 14-inch MacBook Pro.

Protection for a new form factor

A new form factor requires new protection. With a device that measures 5.2 millimeters when open and weighs 254 grams when closed, every millimeter and every gram of grip counts. That is the strength of Alcantara: a soft, breathable layer that provides grip without adding bulk to the design. Do you want to know why this material is so special? Read what alcantara is. For current models, you can find our full range of iPhone cases, and the iPhone 18 Pro case is ready for those choosing the Pro models. Curious about when the iPhone 18 is released? You can read that in our release overview.

Frequently asked questions

When was the iPhone Duo released?

Apple announced the iPhone Duo on September 9, 2026. Pre-orders started on October 16 and sales began on October 23, 2026, initially in over seventy countries.

What does the iPhone Duo cost?

The iPhone Duo costs 2,339 euros in the Netherlands for 256 GB of storage and goes up to 3,839 euros for 2 TB. In the United States, the price starts at 1,999 dollars. This makes it the most expensive iPhone ever.

Does the iPhone Duo have Face ID?

No, the iPhone Duo uses Touch ID in the side button. There is no room for Face ID in the thin bezel.

What is the foldable iPhone called?

The foldable iPhone is called the iPhone Duo. Rumors previously circulated using the names iPhone Fold and iPhone Ultra.

How big is the iPhone Duo?

When folded, the iPhone Duo has a 5.4-inch screen and a thickness of 11.3 millimeters. When unfolded, the screen is 7.6 inches and the device is 5.2 millimeters thin. The weight is 254 grams.