I am a bit late to the party but hey better late than never.
So I have just gone through 4 iPhone XS replacements and one screen replacement in between.
I only came in to the Apple store to swap a battery but because the screws were stuck, they advised to replace the whole unit.
I've gone through so many because of a phenomena dubbed "banding" and it seems to be an occurrence across many OLED displays, not just iPhone.
When I got my 3rd iPhone XS I have noticed the damn line at the top as well. After that, I was offered a display replacement which I accepted. Sadly, even after the display replacement, the line was still there.
After that we tried doing a Restore at the Store as the technician suspected it may be a software issue due to the lines being horizontal rather than vertical. The restore did not fix the issue unfortunately.
After all that I was given another replacement unit which unfortunately has the line at the top as well.
Now that you mention it, I can spot two faint lines(one in the middle and one at the bottom) just like the ones being described here.
Here's a
Video of the lines, uploaded to YouTube
I suspect that this may be a more permanent issue across many iPhone XS and even XR by the looks of it.
Honestly, it is not that big of a deal if this is just one of those things that just so happens during a very specific use case. It is still rather disappointing that a device this premium is burdened by something so silly.
Has anyone managed to get a unit without these lines at all ?
I will most probably go down to the Store one more time to discuss all this but don't think I will bother getting another replacement unit. But then at the same time, another part of me feels like I should try and get to the bottom of this and just keep swapping until I end up with one without these issues.
Honestly the support I have gotten from the Apple Store here in Liverpool has been absolutely outstanding. Perhaps I should just let it be.