No, you do not need to root your phone to use XY Game Booster. XY Game Booster is a performance optimization app for mobile games developed to work on Android devices without root. The way XY Game Booster usually works is to use optimizations and settings that are compatible with the Android operating system without requiring root permissions. This makes it possible for more users to use the application easily and without the need to perform complicated procedures such as rooting the phone, which can be risky and affect the device's warranty.