Faint line in display of brand new iPhone 16

I recently (two weeks ago) purchased an iPhone 16 direct from the Apple Store. Have had zero issues so far, and have not dropped it or anything - I’m the type of person who has never damaged a phone I’ve had, not even a little crack in a screen or anything. Woke up this morning and noticed a (very) faint grey-ish bar in the display. I’ve restarted it, checked for updates, and checked for signs of water damage. Nothing looks off but the line is still there. I have no idea how it could have happened so I’m not sure what to do. I don’t know how I could’ve damaged it, and it just appeared overnight, so I’m hoping it’s just a temporary software issue but I’m worried it’ll persist. I don’t have Apple care because I have never needed it and I’m past the 7 day warranty. Just worried and not sure what to do in case it doesn’t resolve on its own

Anyone know what this is on my screen?

Anyone know what this is on my screen and how to fix it?

Files downloading to Messages?

I have my Safari downloads set to save to my iCloud drive, but yesterday I downloaded a couple things and was unable to find them. Once the download was completed and I tried to click on the file from the download list, it sent me to Messages. At first I thought the download just failed and that it didn’t know where to redirect me so it sent me to Messages. But today i got a notification of “storage full” and when I went in to check what was eating up my memory, it was my Messages. I don’t send media through Messages much so it makes no sense for it to take this much of my memory. Anyone else have this happen? Any known fixes? I’ve restarted my phone multiple times and it’s been 24h at this point. I also downloaded the same file through the Brave browser and it showed up fine.

Cellules data: high consumption

Sorry if already discussed but I can’t find a solution… I have switched off all options and my iPhone 15 max pro still consumes my data: yesterday Service System/General took over 1.1 Gb. Did not use it outside WiFi!!! And I have a 10Gb plan (Thailand) which is now almost empty… How can I stop this to happen? Can someone help me please?

How to remove contacts in bulk that are not registered on WhatsApp?