The prevalence of smartphone addiction among university students has raised concerns about its potential implications on their mental health, academic performance, and interpersonal relationships. This review aims to address the existing gap in the literature and shed light on the psychosocial impact of smartphone addiction in this crucial phase of young adults’ lives. A systematic approach was employed to identify and analyse relevant studies from reputable databases. The selection criteria encompassed studies published between January 2009 and December 2022, in university students. The review synthesises findings from 32 selected studies to present a comprehensive analysis of the psychosocial impacts of smartphone addiction. The results indicated significant associations between excessive smartphone use and adverse mental health outcomes, including increased levels of anxiety, depression, and stress among university students. Furthermore, smartphone addiction negatively influences academic performance, decreasing face-to-face communication and social isolation.