Caution anti-reflective matte means and involves a slight noise as if we pass the law on tracing paper.
To put on a surface perfectly dépoussiérée.L'écran comes with a protective film on one side, instead of 2 usually. So to remove air bubbles with a small rigid plastic card (not included as well), I suggest replacing the protective film on the other side to avoid scratching the matte surface.
If you are unable to remove some, it is probably due to tiny dust. Do not panic, you have the rights to several tests through the screen in warm water with dish soap. But then, caution, you can not make it dry, otherwise new dust will deposit. While careful not to flood the phone you want to protect ...
