Apple’s first foldable phone has arrived, and it is unlike anything the company has shipped before. The iPhone Duo, unveiled at the September 9 “Surprise and Shine” event, opens from a 5.4-inch cover display into a 7.6-inch inner screen—the largest ever on an iPhone, and roughly 80% bigger than the iPhone 18 Pro’s panel. When closed, it is about the size of a passport. When open, it is Apple’s thinnest iPhone to date. But at $1,999, it is also the most expensive iPhone ever made.
What the iPhone Duo Can Do
The Duo runs on the A20 Pro, the same 2-nanometer chip found in the iPhone 18 Pro, with a six-core CPU, seven-core GPU, and dual 16-core Neural Engine for on-device AI. A dual-battery architecture delivers up to 31 hours of video playback on the inner display and 44 hours on the outer screen. The titanium frame and precision hinge are built for durability, and the device carries an IP68 rating for water and dust resistance.
The software is where the Duo differentiates itself. iOS 27 introduces Split View, allowing two apps to run side by side on an iPhone for the first time—including two windows of the same app. App handoff between the cover and inner displays is seamless, with content transitioning instantly as you open or close the phone. The Duo also supports Apple Pencil, making it the first iPhone to do so.
The Pros
The hardware is genuinely impressive. The creaseless nano-texture inner display, liquid metal hinge, and 5.2mm unfolded thickness represent real engineering achievement. Multitasking feels natural and fluid, and the dual-screen handoff is smoother than anything Samsung or Google has managed. For anyone who has wanted a single device that works as both a phone and a mini tablet, the Duo delivers that experience without compromise.
The Cons
The camera system is the biggest compromise. To keep the unfolded chassis slim, Apple omitted the periscope telephoto sensor and variable-aperture array found on the iPhone 18 Pro Max, settling for a simpler dual-camera setup. The folding screen also lacks the ingress protection of a standard IP68 slab, making it less suited to dusty or physically punishing environments. The price is the other barrier: at $1,999 for 256GB, the Duo costs $700 more than the iPhone 18 Pro Max.
Pricing
The Duo comes in four storage tiers: 256GB for $1,999, 512GB for $2,199, 1TB for $2,599, and 2TB for $3,199. It is available in star white and night sky. Pre-orders open October 16, with availability from October 23 in more than 70 countries. There is no free tier and no cheaper model.
Who Should Buy It
The iPhone Duo is for executive multitaskers who juggle spreadsheets, video calls, and documents on the go; creatives who want a pocketable sketchpad with Apple Pencil support; and early adopters who want the most advanced industrial engineering Apple has ever produced. If you prioritize camera quality, rugged durability, or value for money, the iPhone 18 Pro Max is the better buy. If you mostly use your phone for social media, messaging, and photos, the foldable form factor adds little to your daily experience.
The Bottom Line
The iPhone Duo is Apple’s most ambitious iPhone in a decade. It solves the core problems of foldable design—durability, software adaptation, and screen handoff—with the polish users expect from Apple. But it arrives at a price that puts it firmly in halo-product territory, and its camera compromises are real. For the right user, it is a genuinely transformative device. For everyone else, it is a beautiful glimpse of where the iPhone is heading—next generation, or the one after.