The crisis for the foldable iPhone; Do the screens break? Reports published from Japan, China, Australia and several other countries point to a problem with the display of the folding phone "iPhone Duo"; A problem that could be troubling for Apple. According to these reports, some users have faced the appearance of a black line along the fold of the phone's hinge after only a few days of use; A line that links to screen failure in some cases. The worrying point is that some of the devices on display in stores are said to have also faced this problem.