I have a question about the Telekom 24-month warranty. Does anyone know anything about it or have had experience with it?

Here's what I did: I bought an iPhone 14 Pro on eBay. It worked perfectly and without any problems for six months, but now, since I updated to iOS 18, the screen has started showing signs of wear (there are no cracks in the glass, dents, or repairs on the phone). Yesterday I went to…