Have you ruled out the iPhone Duo from your list because of the impression that foldable iPhones are heavy and bulky? When I checked the official specifications, the weight difference was only 5 grams compared to the iPhone 18 Pro Max, and the volume when closed was calculated to be almost the same. You don’t have to rule it out just because of weight or bulk. The deciding factor is the shape of the device and the size of the screen when opened.
Compare the size and weight of iPhone Duo
The iPhone Duo weighs 254 grams, and the iPhone 18 Pro Max weighs 249 grams, a difference of only 5 grams. Even if you compare them at a store, it would be difficult to tell the difference.
If you do the calculations, you will see 3 points.
- The weight difference is only 5 grams, which is about 2%.
- The volume when closed is almost the same based on the calculation of the external shape.
- The surface area occupied by the iPhone Duo is approximately 20% smaller.
| item | iPhone Duo | iPhone18 Pro Max |
|---|---|---|
| width | 84.1mm (closed) / 164.6mm (open) | 78.0mm |
| height | 117.8mm | 163.4mm |
| thickness | 11.3mm (closed) / 5.2mm (open) | 8.75mm |
| weight | 254g | 249g |
*Apple states that size and weight vary depending on configuration and manufacturing process.
Thickness evaluation is opposite depending on whether it is open or closed. When opened, it measures 5.2 mm, which is about 60% that of the iPhone 18 Pro Max, and Apple called it the thinnest iPhone ever. However, when folded, it expands to about 1.3 times its size, and the relationship between the two is reversed. The bar-shaped iPhone did not have the property that the thickness changes depending on the state. For now, let go of the way you compare the thickness of catalogs using a single number.
Is the iPhone Duo heavy at 254 grams?
When comparing iPhone 18 Pro (211 grams) and Pro Max (249 grams), the difference reaches 38 grams. 5 grams is only about 1/7th of that amount.
If your current iPhone is a Pro size, imagine switching to a Pro Max. Moving to iPhone Duo is a much smaller change. If you attach the case, the 5g difference will be further covered. The design is impressive, with a hinge, two displays, and a battery separated on both sides, all within a 5-gram difference. Apple explains the use of titanium in terms of strength, and does not disclose the weight breakdown.
Examining how bulky a foldable iPhone is
It’s too early to judge how easy it is to handle in a bag just by its thickness and weight. The author calculated the external shape as a rectangular parallelepiped based on Apple’s official width, height, and thickness. This is an approximate value that does not include rounded corners or camera overhang.
The volume when closed is almost the same
The closed iPhone Duo is about 112 cubic centimeters, and the iPhone 18 Pro Max is about 112 cubic centimeters, so the calculated difference is less than 1%. However, the published thickness does not include the protrusion of the camera part, so the actual difference may be wider than the calculated value.
The area occupied by the table is approximately 20% smaller
The area occupied by the table was approximately 99 square centimeters for iPhone Duo and approximately 127 square centimeters for iPhone 18 Pro Max. When opened, the volume decreases to approximately 101 cubic centimeters, making it almost like a thin plate.
The iPhone Duo is determined by its shape rather than its size.
Height is 45.6 mm lower and width is 6.1 mm wider.
Even if the volume is almost the same, the shape determines where it will fit. The closed iPhone Duo is 117.8 mm tall, 45.6 mm lower than the 163.4 mm iPhone 18 Pro Max, and 6.1 mm wider. The length is 4.5 cm shorter, so it fits easily into a shirt’s chest pocket. On the other hand, since it is wider, it tends to feel cramped in the front pocket of narrow pants.
Easy to use at ticket gate and unlocking
iPhone Duo is compatible with FeliCa and Suica, and uses Touch ID on the side button for biometric authentication. Both ticket gates can be passed through the ticket gates without authentication using an express card, but the operation habits of the iPhone 18 Pro Max with Face ID differ when unlocking and purchasing approval are required.
What do you think about the price difference of 125,000 yen?
The iPhone 18 Pro Max starts at 239,800 yen, and the iPhone Duo starts at 364,800 yen. Release dates are September 18th and October 23rd, leaving exactly 5 weeks.
The 125,000 yen price difference is mainly due to the 7.6-inch screen when opened. However, the camera configuration is different, and the iPhone Duo does not have the telephoto lens that the iPhone 18 Pro model has. I’d like to see what I’m giving up in exchange for screen space. Please compare the dimensions of the iPhone you are currently using with the table below. The starting point for making a decision is whether the shape, which is 4.5 cm shorter in height and 6 mm wider in width, will fit in your pocket.
Source: iPhone Mania
