It is used to replace your broken, damaged, cracked or unusable screen. Each screen is tested before shipping and are 100% working. No installation instruction included. Professional install is recommended. Strongly suggest test before finally installation. If test OK, please install it. If it is not show, please contact us first. DO NOT force it to be installed in mobile phone. We will not be responsible once the screen is installed. Compatible with: Samsung Galaxy S8 Plus G955 G955F S8+