The most interesting part of this game is the opportunity to speak with ghosts and receive answers in real time. You need it to collect enough information about phantom and find its name. First, you can use your microphone and ask through voice chat.
The second option is an Ouija Board that helps you discover the location of the demon, its story, cause of death and listen about its victims. Finally, purchase a Phasmophobia Spirit Box to get extended data about it, like age and personality. Go and try other useful objects here!