Ghost screen on a phone refers to a condition where the screen displays certain images or flickers continuously without any user input. This can occur due to several reasons, such as software glitches, hardware malfunction, water damage, or physical damage to the screen. Ghost screen can be frustrating to deal with as it can interfere with the user's ability to access and use features on their phone. To resolve this issue, users can try restarting their phone, performing a factory reset, updating or reinstalling their phone's operating system, or seeking professional assistance from a phone repair technician.