iPhone Duo Size Comparison
Last updated
The fold changes width, not height. The short side stays 117.8 mm. Opening the phone turns the 84.1 mm width into 164.6 mm and drops the body from 11.3 mm to 5.2 mm. Weight stays 254 g.
Dimensions from Apple's iPhone comparison. Full sheet: iPhone Duo specs.
Folded and open millimeters
| Model | Height | Width | Thickness | Weight | Screen |
|---|---|---|---|---|---|
| iPhone Duo, folded | 117.8 mm | 84.1 mm | 11.3 mm | 254 g | 5.4" |
| iPhone Duo, open | 117.8 mm | 164.6 mm | 5.2 mm | 254 g | 7.6" |
| iPhone 17 Pro Max | 163.4 mm | 78.0 mm | 8.75 mm | 233 g | 6.9" |
| iPhone 18 Pro Max | 163.4 mm | 78.0 mm | 8.75 mm | 249 g | 6.9" |
The 17 Pro Max and 18 Pro Max share the footprint. The 18 Pro Max is 16 g heavier, at 249 g instead of 233 g.
What that means next to a Pro Max
In a pocket, the folded Duo is the shorter phone. Its 117.8 mm height sits 45.6 mm under the Pro Max's 163.4 mm. It is also the wider phone: 84.1 mm against 78.0 mm, a 6.1 mm difference. Folded thickness is 11.3 mm, which is 2.55 mm more than the Pro Max's 8.75 mm.
Open, do not read the Duo as a taller slab. The 117.8 mm side stays the short side. The body becomes 164.6 mm wide and 5.2 mm thick. That open width is 1.2 mm longer than the Pro Max is tall. The inner screen is 7.6 inches; the Pro Max screen is 6.9 inches.
Weight goes the other way. The Duo is 254 g folded or open. That is 21 g more than the 17 Pro Max and 5 g more than the 18 Pro Max.
Overlay both bodies at the same scale in the size comparison tool. The full catalog is on the iPhone size chart.
FAQ
How big is the iPhone Duo folded and open?
Folded, the iPhone Duo is 117.8 mm tall, 84.1 mm wide, and 11.3 mm thick. Open, it is 117.8 mm tall, 164.6 mm wide, and 5.2 mm thick. It weighs 254 g either way. The outer screen is 5.4 inches and the inner screen is 7.6 inches.
Is the iPhone Duo bigger than a Pro Max?
Folded, no. It is 45.6 mm shorter than the iPhone 17 Pro Max and iPhone 18 Pro Max, and 6.1 mm wider. Open, the body is 164.6 mm wide by 117.8 mm tall, and the inner screen is 7.6 inches versus the Pro Max 6.9-inch display.
How thick is the iPhone Duo compared with a Pro Max?
Folded, the Duo is 11.3 mm thick. The iPhone 17 Pro Max and iPhone 18 Pro Max are 8.75 mm thick. Open, the Duo is 5.2 mm thick.
Does the iPhone Duo weigh more than a Pro Max?
Yes. The Duo is 254 g. The iPhone 18 Pro Max is 249 g and the iPhone 17 Pro Max is 233 g. The 17 Pro Max and 18 Pro Max share the same 163.4 × 78.0 × 8.75 mm body.