Apple Unveils First Foldable iPhone Duo
Apple unveiled its first foldable smartphone, the iPhone Duo. The company also introduced a variable aperture for the first time on the iPhone 18 Pro and Pro Max, while improving computing performance and thermal management.
Apple unveiled the iPhone 18 Pro, Pro Max and iPhone Duo at a product event on Sept. 10. The Pro models will go on sale Sept. 18, followed by the Duo on Oct. 23. Prices start at $1,199 for the iPhone 18 Pro, $1,299 for the Pro Max and $1,999 for the iPhone Duo.
Apple did not announce the countries where the iPhone Duo will initially be available.
“The iPhone Duo, iPhone 18 Pro and Pro Max are designed to serve as intelligent personal hubs for users,” Apple Chief Executive Officer John Ternus said. “We put powerful performance and features at the center of the experiences users value most.”
The biggest change is the introduction of a foldable form factor. The iPhone Duo has a 7.6-inch inner display and a 5.4-inch outer display. The inner screen offers 50% more display area than the iPhone 18 Pro Max and 80% more than the Pro. Users can operate the device with one hand when folded and use the larger screen for multiple tasks when unfolded.
Apple also changed how iOS 27 works to take advantage of the larger display. Users can run two apps side by side or open two windows of the same app simultaneously, such as reading an email while viewing a document or comparing two webpages. An app running on the outer display continues on the inner screen when the device is unfolded, while content and controls adjust depending on the folding angle.
The iPhone also supports Apple Pencil for the first time. Starting later this year, the USB-C Apple Pencil can be used on both the inner and outer displays, bringing handwriting, drawing and document annotation features previously centered on the iPad to the iPhone.
Apple also detailed measures to improve crease visibility and surface durability. High-strength glass is placed above and below the organic light-emitting diode (OLED) panel, while a viscoelastic adhesive allows individual layers to move when folded to reduce deformation. A nano-texture surface treatment reduces reflections and glare, making the crease less visible.
The hinge consists of more than 100 precision components. A lower titanium plate and carbon-fiber support plate reinforce the display. During manufacturing, Apple uses a confocal laser to measure the surface profile of each device and applies thin photopolymer layers to correct residual unevenness.
The inner display uses an under-display camera for the first time on an iPhone, reducing the area that obstructs content. The device uses Touch ID integrated into the side button for unlocking. Its exterior is made from Grade 5 titanium and supports IP68 water and dust resistance.
The two displays can also be used for photography. Users can take selfies with the 48-megapixel rear camera while framing shots on the outer display. A preview feature lets subjects see themselves on the outer screen while being photographed.
The iPhone Duo is powered by the A20 Pro and Apple’s C2 modem. A vapor chamber boosts sustained performance by as much as 35% compared with the iPhone 17 Pro. The device manages two battery cells as a single system and provides up to 31 hours of video playback using the inner display and 44 hours using the outer display.
Storage ranges from 256 gigabytes to 2 terabytes. The device will be available in Star White and Night Sky, with preorders beginning Oct. 16.
The iPhone 18 Pro and Pro Max focus on improvements to photography and sustained performance. The key camera change is a variable aperture introduced for the first time on the 48-megapixel main camera. Unlike a fixed aperture, six polymer-composite blades move to control the amount of light entering the lens.
The variable aperture adjusts both light intake and depth of field depending on shooting conditions. It opens wider in dark environments to capture more light and narrows when users want multiple subjects in focus. Apple said it captures as much as 50% more light in dark conditions. Users can also manually select from four aperture settings.
Apple also added the ability to apply cinematic effects to standard video after recording. For photos, Apple Reference Image signs sensor data at capture and stores an unalterable image alongside the edited version to strengthen original-image verification.
The Pro models use the A20 Pro processor built on a 2-nanometer process. It includes a six-core central processing unit (CPU), seven-core graphics processing unit (GPU) and dual Neural Engines with a combined 32 cores. High-performance CPU core performance improves by as much as 20%, while GPU performance increases by as much as 40%.
Apple also redesigned thermal management. The chip and memory are positioned side by side to transfer heat directly from the chip to the vapor chamber, which is three times larger than the one in the iPhone 17 Pro. The design is intended to reduce performance degradation during prolonged gaming and artificial intelligence workloads. Sustained performance improves by as much as 40% from the previous generation.
Video playback reaches as much as 36 hours on the Pro and 45 hours on the Pro Max for eSIM-only models. The Pro now provides battery life comparable to the previous Pro Max. The battery can be charged to 50% in about 15 minutes.
The Pro models will be available in Deep Black, Silver, Glacier and Burgundy, with preorders starting Sept. 12.
Apple is also bringing Siri AI that uses personal context to all three models. It can respond to requests and perform tasks in apps using information from emails, messages, the screen and camera. Korean-language support is scheduled to be added in October.
“The iPhone Duo demonstrates the creativity, ingenuity and dedication of teams across Apple,” Ternus said. “It shows what is possible when we bring together the capabilities of our teams to create products that are meaningful to customers.”