Question: Can the screen protector be used with the mobile phone case? Do we need to buy additional special phone case? Answer: You don't need to buy additional special phone case, our screen protector can be used with most ordinary mobile phone cases. Our screen protector is designed to be slightly smaller than the mobile phone screen, so as to protect the mobile phone screen while allowing the mobile phone to fit most mobile phone cases. Question: How to prevent dust during the installation of the screen protector? What should I do if bubbles appear after installation? Answer: Before installing the protective film, you can use the kit included with the package to clean the screen to remove dust. If you find bubbles after installation, you can push the bubbles out of the screen by using a small card. However, a thin pad needs to be placed on the protective film to avoid damage to the screen. Question: Can the screen protector be used with the mobile phone case? Do we need to buy additional special phone case? Answer: You don't need to buy additional special phone case, our screen protector can be used with most ordinary mobile phone cases. Our screen protector is designed to be slightly smaller than the mobile phone screen, so as to protect the mobile phone screen while allowing the mobile phone to fit most mobile phone cases. Question: How to prevent dust during the installation of the screen protector? What should I do if bubbles appear after installation? Answer: Before installing the protective film, you can use the kit included with the package to clean the screen to remove dust. If you find bubbles after installation, you can push the bubbles out of the screen by using a small card. However, a thin pad needs to be placed on the protective film to avoid damage to the screen.