Some iPhone Duo screens are already failing
Apple’s “precision-engineered” hinge is apparently damaging some iPhone Duo screens.

TL;DR
- Early iPhone Duo buyers are reporting hardware flaws causing the internal display to fail within hours or days of use.
- The damage appears as bright lines on the OLED screen, originating from the crease or below the midpoint.
- iFixit's teardown suggests a mechanical misalignment in the hinge is stressing the OLED panel, leading to damage.
- Some users have reported successful replacements at Apple stores, but spares may be limited.
- This issue is reminiscent of early problems with other foldable phones, including Samsung's Galaxy Fold.