iPhone Duo Interesting Facts That Will Make You Rethink Everything About Apple

You may notice that when you open the iPhone Duo for the first time, the screen doesn’t crease. This week, people who got to try it out early talked about it almost right away. Not the cost. Not the power supply. The fold, or rather, the lack of one. That tells you something about what Apple has been working on behind the scenes for years and how they finally felt ready to enter a market that Samsung has been in since 2019.

The iPhone Duo is Apple’s first foldable smartphone. It came out on September 9 and costs $1,999. It’s clear why that price gets people’s attention. But below the big numbers are some of the most interesting facts about this device that you should pay attention to.

Start with the screens. The outer and inner screens both have the same aspect ratio of 1:1.4, which means that when the inner screen is unfolded, it takes up half of the cover screen. This may seem like a small design choice, but it’s what makes iOS so flexible in its ability to switch between states. Apple basically redesigned the operating system around this symmetry. They moved the dock to run vertically along the side edge, showed two home screens at the same time on the inner display, and let apps change how they are positioned based on how far the phone is folded. It’s possible that no one but Apple’s engineers fully understood how much work that kind of symmetry would make possible until the hardware came out.

The screen on the inside is 7.6 inches, which is about the same size as an iPad Mini. It’s made of 10 very thin layers and has a nano-texture matte finish that cuts down on glare and, more importantly, makes it nearly impossible to see or feel the fold line. While Apple could have fixed the crease with software tricks, it looks like they looked at the problem at the level of the materials. No one has yet been able to answer the question of whether that nano-texture will hold up after years of being folded every day.

Then there’s the camera for FaceTime on the inside screen. It’s completely hidden under the screen until you need it. It’s not there when you’re browsing or watching videos. It goes away. Since Apple hasn’t used an under-display camera before, this device looks very different from anything else the company has made. The large matte inner screen goes really well with the camera installation.

The A20 Pro chip inside is the same processor that’s in the iPhone 18 Pro—no cuts or turned-off cores. Because it’s harder to cool a chip that powerful inside a folding phone body than inside a regular phone body, the 18 Pro’s long-term performance is about 35% higher than the 17 Pro’s, not exactly the same as the 18 Pro’s. Still, the difference probably won’t make a difference for most everyday tasks. The fact that Apple didn’t skimp on the silicon itself is interesting. This shows that they want this to be taken seriously as a flagship.

The story of battery life is a little more complicated. The Duo has two batteries, one on each half. The outer screen can play videos for up to 44 hours, and the inner screen for up to 31 hours. That makes it better than the iPhone Air but not as good as the 18 Pro Max. Those scores are better than they should be for a first-generation foldable that is only 5.2 mm thick when open.

Some parts of the software are subtle but well-thought-out. StandBy mode, which is Apple’s bedside clock and widget display that came out a few years ago, now works on the Duo even when the phone is not plugged in. It folds up like a tent and sits on your nightstand. It can be used as a clock or picture frame with just a battery. That’s not important. But it’s the little things like that that change how you use a device every day.

Some people thought the camera situation would be more tense than it is. Both of the back cameras are 48MP wide and ultra-wide; there is no telephoto. It doesn’t have a variable aperture like the 18 Pro does. Apple made up for some of this with software, like the Smart Take feature that takes a picture automatically when everyone in the frame is ready, and the Kid Cue mode, which plays Peanuts animations on the outside screen to get kids to look at the camera. It’s a small, personal touch that isn’t always talked about along with the spec sheet numbers.

Seeing how everything fits together makes me think that Apple put off releasing the foldable idea until it fixed the issues that made the first foldables feel like they were a compromise. Nobody can see a crease. IP68 protects against water. A titanium frame with a hinge made of more than 100 carefully engineered parts. Starting October 23, customers will have to decide for themselves if $1,999 is the right price for the iPhone Duo.