The iPhone Duo officially goes on sale today, but a few units already have broken screens. According to posts on Reddit about the affected units, the issue appears to be happening at a similar spot on all of them: Some kind of problem shows up on the inner screen along the hinge and a strange bright line (or lines) across the right side of the display.
Here's how one user in Australia described what happened to their phone: Had my iPhone Duo for about six hours and had probably opened it fewer than 20 times. I was showing it to a friend, and as I opened it, I felt something around the internal hinge, underneath the screen.
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