How this review was made: it is based on Apple’s published specifications and on tests published by other reviewers, listed at the end. It is not a long-term personal test, and where a claim comes from one reviewer, I say so.

Most people expected Apple’s foldable to be about the screen. It is, but the more interesting decision is the shape. Instead of a tall, narrow phone that opens into a square, the iPhone Duo is a short, wide phone that opens like a book. That choice explains nearly everything good and everything awkward about it.

Two displays, one idea

The outer display measures 5.4 inches. Apple says it offers about 90 percent of the screen area of an iPhone 18 Pro, in a much shorter body. Open the Duo and you get a 7.58-inch inner display, the largest ever on an iPhone and roughly 50 percent larger than the iPhone 18 Pro Max.

Apple’s own design guidelines reveal the thinking. When the phone is closed, tab bars and toolbars move to the side of the screen to save vertical space. Open it, and apps expand rather than turn into something else. Mail shows either a list or a message when closed, and both side by side when open. The goal is one app in two sizes, and not two separate experiences.

That matters more than any specification, because it depends on developers. Apps built to resize properly should adapt with little work. Apps that are not will show their age, and early reviews suggest this is where most of the Duo’s frustrations sit.

The hinge and the crease

This is where foldables usually lose people, and early impressions are encouraging. Hands-on reports describe a hinge that feels smooth but firm, needing a little intention to open. The crease has not disappeared. Tom’s Guide says it is visible if you look closely, while another early report calls the dip almost imperceptible in use. The Duo is also rated IP68, which foldables have historically struggled to match.

Open, Apple calls it the thinnest iPhone ever. Closed, it is another matter. Reports describe it as dense rather than heavy, and Tom’s Guide notes it is neither as thin nor as light as Samsung’s Galaxy Z Fold 8.

What you actually use it for

Split View on the inner display is the reason to buy this phone. Reading a document while writing notes, or keeping Messages beside a browser, is the kind of task a normal phone makes clumsy. CNN’s week-long review found the Duo handled split-screen combinations with little complaint, and also that the overall picture was complicated by software frustrations.

The strongest case against it came from PetaPixel, which argued the Duo does not solve problems an iPad does not already solve, and found it awkward for typing. That is fair. If you already carry an iPad, the inner screen is a much smaller reason to spend this money. The Duo makes the most sense for someone who wants one device and is willing to pay to avoid carrying two.

Cameras and battery

The Duo uses the A20 Pro chip with a dual-battery design, and Apple rates it for up to 31 hours of video on the inner display and 44 hours on the outer one. Those are Apple’s figures, and I have not seen enough independent long-term testing to treat them as settled.

The cameras are good but not the best Apple sells. There is a 48MP Fusion main camera with an integrated 2x optical-quality telephoto, and a 48MP ultra wide with macro. Missing are the 4x telephoto and variable aperture of the iPhone 18 Pro. There is also a new FaceTime camera beneath the inner display. If photography is why you buy iPhones, the Pro remains the better tool.

The price

It starts at $1,999 with 256GB and reaches $3,199 at 2TB. Supply was reported as tight at launch. In Bangladesh, expect to pay reseller prices above those figures, and check carefully what warranty and repair support you are actually getting. On a device with a hinge and a folding screen, that is not a small detail.

Should you buy it?

Buy it if you read and work on your phone for hours, you do not want to carry a tablet, and the price does not hurt. Otherwise, the sensible choice is to wait for a second generation, when apps will have caught up and the price may have room to move. As a first attempt, though, it is remarkably sure of what it wants to be.

Sources