[perth]

So scratching definitely still happens, both on sapphire camera lenses and new scratch-resistant screen technology. I’ve mainly had it happen with concrete. I think concrete sometimes just has some rocks in it that have a very high hardness because I’ve gotten pretty thick scratches in new iPhones when they’ve taken a slide over a rough concrete sidewalk due to a drop while walking.

[kuschku]

I've similarly experienced bad scratches whenever my phone and my keys come into contact, hardened steel may still be able to cause scratches?

[IgorPartola]

Your keys are by no means hardened steel. If they are steel at all (most are brass or silver/zinc), they would be mild steel. If they were hardened they would be really difficult to cut. The harder you make a steel the more brittle it gets. Think about what happens when you slam a file with a hammer vs a large nail.

[UniverseHacker]

This should not be possible with any type of modern phone screen. Do you perhaps have a plastic screen cover that is scratched? Or key metal could be deposited on the screen and just need to be scraped off

[HWR_14]

Aren't both the lens and the screen are resilient to steel/metal scratches? I'm not willing to run keys or a knife over a phone on purpose.