Smartphone overuse has led to many issues, one of which is smartphone addiction. At the same time, musical habits including (1) music listening, and (2) music playing and creating are becoming increasingly popular. Built on the theories of habit and self-control, the purpose of study was to examine how these two musical habits influence smartphone addiction. We found that self-control served as a mediator of the relationships between these musical habits and smartphone addiction. Our results also showed that the interaction between musical listening habit and musical preference positively affected self-control, while music playing and creating habit negatively affected it. This study has both theoretical and practical contributions to preventing and/or reducing smartphone addiction.