iPhone Duo Hands-On: Apple’s Foldable is Finally Here! (Video)

Apple finally made an iPhone that folds, and after spending a good chunk of the day with the iPhone Duo at Apple Park, the part I keep coming back to is what happens when you open it. You can run two apps side by side, take a selfie with the rear camera while watching the shot on the outer screen, or set the phone down half-folded and let it take the group photo for you. It's the most interesting iPhone I've used in years. It also costs $1,999, so it raises some expensive questions.

Start with the screens. There's a 5.4-inch display on the outside and a 7.6-inch display inside, and those diagonals hide the fact that this phone is short and wide. Apple says the outer screen gives you about 90 percent of the screen area of an iPhone 18 Pro, and opening it gets you roughly 50 percent more display area than a Pro Max. Closed, it's a normal, usable phone. Open, you have room to put things next to each other: a hotel confirmation in one window, your notes in the other, no more bouncing between apps trying to remember which address you copied. You can also run two windows of the same app, and save what Apple calls app pairs so Photos and Messages always open together.

The demo that sold me was small and specific. Drag a few images from Notes into Keynote, then fold the Duo halfway closed like a tiny laptop. Keynote recognizes the angle and puts your presentation on the top half and your speaker notes on the bottom. Netflix does something similar, with video above the fold and controls below. How consistently developers use that space is an open question, though I expect a lot of them will. Fold or unfold the phone and whatever you were doing carries across without relaunching, with a see-through animation that keeps you oriented. Apple Pencil support on both displays is promised for later this year, and it's far enough out that nobody got to demo it at the event.

Some of the best features have nothing to do with multitasking. Half-fold the phone, set it down, and Smart Take starts snapping as soon as it sees people posing, so nobody has to sprint back from a timer. Duo Preview puts your subject on the outer screen so they can see themselves, or lets you frame a selfie with the main camera. Kid Q swaps that preview for an animation (Apple showed Peanuts characters) to hold a toddler's attention. StandBy works whenever the phone is resting and locked, no charger required.

Now the crease. It exists. Apple never claimed otherwise, and if you film the screen you'll see it. But the inner display has a nano-texture finish, which cuts the reflections that make a crease obvious, so looking at it with your own eyes it's hard to spot. Both camps in the comments are right. Apple says the display material is 40 percent stiffer than industry materials, which isn't the same thing as 40 percent more scratch-resistant, so long-term wear is still a question. The hinge has more than a hundred parts, and the display stacks glass above and below the OLED with a titanium backing plate and adhesives that let the layers slide, the way pages in a paperback shift when you bend it.

Apple calls it the thinnest iPhone ever: 5.2mm open, 11.3mm folded, 254 grams, about five grams more than an 18 Pro Max but wider and thicker in the pocket. The trade-offs go beyond shape. You get a 48MP main camera and a 48MP ultrawide, with 4K Dolby Vision at up to 120fps, but no telephoto (2x is a crop), no variable aperture, no LiDAR, and no ProRes or Log. Face ID is gone in favor of Touch ID in the side button, and the Action button is gone too. The inner camera sits under the display and records up to 1080p. For someone living in documents and messages all day, the workspace may be worth more than a telephoto. For someone shooting concerts, probably not.

Inside is the same A20 Pro as the 18 Pro, with memory moved beside the chip and a graphite layer that carries heat across the hinge. Apple claims up to 35 percent better sustained performance than the iPhone 17 Pro, and that's the number I want to test after a long gaming session. Battery gets two ratings: up to 44 hours of video playback on the outer screen, 31 on the inner. If you're buying this to keep it open, 31 is your number. A 60-watt or higher adapter gets you to 50 percent in around 20 minutes.

Pricing runs from $1,999 with 256GB to $3,199 at 2TB. Pre-orders open October 16, and it ships October 23, about five weeks behind the iPhone 18 Pro, which was my biggest disappointment of the day. I still want to live with this shape, watch how apps adapt, and test the cameras and battery before calling it a buying recommendation. After a day with it, I can say the iPhone Duo is really fun, and I'm curious what you'd do with the bigger screen.