Mobile phones are indispensable for many young adults, but such devices may negatively affect their mental health and well-being. Previous studies revealed a significant association between shyness and mobile phone addiction. This study further explored this association, its underlying mechanisms, and the mediating effects of self-control and attachment anxiety of mobile phone addiction. Investigational methods included a cross-sectional design and multiple questionnaires, namely the College Students' Shyness Scale, Experiences in Close Relationships Inventory, College Students' Self-Control Scale, and Mobile Phone Addiction Index. Correlation analysis indicated that shyness, attachment anxiety, and mobile phone addiction have significant, positive correlations with each other, as well as significant, negative correlations with self-control. Hayes's PROCESS macro revealed that self-control and attachment anxiety played multiple mediation roles in the relationship between shyness and mobile phone addiction. In other words, (1) shyness was negatively associated with mobile phone addiction, (2) both attachment anxiety and self-control played partial and parallel mediating roles between shyness and mobile phone addiction, and (3) attachment anxiety and self-control mediated the link between shyness and mobile phone addiction sequentially. The results of this study indicate that mobile phone addiction among shy young adults can be eliminated through the development of self-control and alleviation of attachment anxiety.
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