The iPhone Duo is officially going on sale today, but a few units already have broken screens. Based on posts about the affected units on Reddit, 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.As I cont …Read the full story at The Verge.