Here’s why the iPhone Duo’s hinge could be cracking the screen

Within hours of the iPhone Duo launch last Friday, people reported that the inner screen on some brand new foldable phones was already broken. The issue was similar across many photos shared on social media: some kind of issue or crack would appear in the middle of the screen above the hinge, with lines appearing on the right side of the display. On Monday, Apple acknowledged an "issue" and said it's replacing damaged units, without going into much detail about how many broken phones have been reported so far.

Shahram Mokhtari, the lead teardown technician at iFixit, has actually taken apart the iPhone Duo and …