I have an iPhone 6 plus whose casing is made of anodized aluminium and stainless steel. This was recently marked by a case (see picture below). The makers of the case are insisting that the phone has overheated and caused the problem. I was wondering how hot does the phone have to get to mark this anodized aluminium or stainless steel finish?
Is it possible for the phone to get hot enough without it tripping the phone and turning it off until it cools?