Abstract: This paper reviews Francisco Yus’ (2022) Smartphone Communication: Interactions in the App Ecosystem.The book attaches importance to the communication in the context of Web 3.0 and focuses on the research of smartphone communication in the app ecosystem.It innovates the traditional relevance theory through adding non-propositional cognitive effects and contextual constraints, and applies the new theory into analysis of smartphone communication.The book is of great significance by outlining the future issues for smartphone communication research, which can enrich the existing internet pragmatic studies, stimulate academic researchers to conduct in-depth exploration of online language use and shed lights on Chinese smartphone communication studies.