iPhone Duo Clears 20,000 Folds in Durability Test

Foldable phones live or die on their hinges, and the iPhone Duo has now been pushed through 20,000 folds on a fold-testing machine. Reviewers use that kind of number to judge whether a folding design can handle daily use, since every open and close puts stress on the screen and the hinge.

The result also sets up the comparison that matters most in this category. Samsung's Galaxy Z Fold 8 is the device most buyers will hold the iPhone Duo against, so the obvious question is whether Apple's foldable holds up as well or better under the same repeated stress.

A fold count is only part of the picture. A machine does not capture how a hinge feels after months in a pocket, how the crease looks over time, or how the screen handles dust and drops. Those are the areas where real-world testing will settle the verdict.