In 'Hello, Who's Calling?', players assume the role of an amateur detective who receives mysterious phone calls from a variety of unusual characters. Each call unfolds a unique story filled with suspense and intrigue, challenging players to piece together clues and make choices that will impact the narrative's outcome. As players navigate through a web of lies, oddball personalities, and unexpected plot twists, they must determine who is telling the truth, who is lying, and how the calls connect to a larger conspiracy that threatens the city. The game concludes with multiple endings based on the player’s decisions, adding to replayability and engagement.