Joanna Stern reviews iPhone Duo: 32,640 folds with no hinge wear

Joanna Stern spent a week testing Apple's $2,000 foldable iPhone Duo, including a custom robot that folded it 32,640 times over four nights. She found no noticeable hinge deterioration, but flagged bugs and first-generation compromises.

• A servo-powered robot folded the Duo 17 times a minute, 8,160 folds per night
• After 32,640 folds the hinge was slightly stiffer, with no visible wear
• Review praises the matte folding screen and versatile form factors
• Bugs, occasional frustration and first-gen compromises remain