Because the screen of the mobile phone is curved, there is an "air line" left on the edges, precisely because the screen protector does not adhere well. Otherwise, it looks like a very high-quality glass.

27/12/2022: After 2-3 falls of the mobile phone, the screen protection now has 3 cracks and a small piece has come off from one edge. I have the original silicone case from Nokia, which embraces the phone and protrudes slightly upwards - higher than the height of the screen, so I consider it also helps in protecting the phone's screen. The good thing is that the screen has not been broken! I will try another screen protector this time.