The foldable iPhone Duo gives you a bigger screen and bragging rights. Here's what you give up.

The iPhone Duo may look flipping cool — but to get two screens and a hinge into a pocketable iPhone, Apple had to make some trade-offs.

But even at $700 more than the iPhone 18 Pro Max, the Duo had to put some hardware and capabilities on the cutting-room floor to make room inside the device for new mechanical components.

Sure, early adopters get immediate bragging rights and some cool features that are only available on the foldable phone — but it comes at a cost.

It's not all bad news for photogs. The foldable design includes the 48-megapixel ultrawide lens for wide landscapes and close-up macro shots. That's nearly the same updated hardware found on the iPhone 18 Pro Max.

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And, Duo's outer screen serves as a viewfinder when users activate the rear cameras, a first for an iPhone. That lets the subject see the shot as it's being taken, a feature that, on X, people are calling boyfriend-friendly.

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Bottom line: You gain some cool new photo-taking features, but give up some of the top-of-the-line camera tech found in the iPhone 18 Pro lineup.

The iPhone Duo is the first premium iPhone in years to swap Face ID for Touch ID. Instead of unlocking the device by looking at it, Duo owners will use a fingerprint sensor built into the side button—or their Apple Watch.

On the iPhone 18 Pro models, the Action button can be set to silence the phone, open the camera, start a voice memo, trigger a shortcut, or enable focus mode.

The Duo has two batteries, but its big inner display still draws more power.

Charging will take a bit longer, too. Apple says it takes the Duo 20 minutes to gain 50% of charge from a 60W-capable adapter. It'll take the iPhone 18 Pro Max 15 minutes to get the same amount of juice.