Zach Nelson of JerryRigEverything wasted little time putting Apple’s first foldable, the iPhone Duo, through the usual sequence of scratches, flames, dust, and bends the day after it went on sale. Outer glass held up in familiar fashion. Ceramic Shield 2 on the front panel showed only the faintest marks once the Mohs hardness picks reached level seven, with deeper grooves appearing at level eight, matching what earlier iPhones have delivered.