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A total of 2549 participants (1025 girls; <jats:italic>M<\/jats:italic><jats:sub>age<\/jats:sub>\u2009=\u200914.10\u2009years, <jats:italic>SD<\/jats:italic>\u2009=\u20090.96\u2009years) from grades 8 to 12 in Southern British Columbia, Canada, took part in the study. Self\u2010reported problematic smartphone use was collected annually over 4\u2009years. At Time 1, adolescents provided self\u2010reports on self\u2010regulation, depression, anxiety, and FoMO. Growth mixture modelling was used to examine the trajectories of problematic smartphone use. The results revealed three distinct trajectories: low\u2010increasing\u2010decreasing (35.5%), moderate\u2010increasing (60.9%), and high\u2010stable (3.6%). Multinomial logistic regression revealed that higher FoMO and depression were significant predictors of membership in the high\u2010stable problematic smartphone use group, while better self\u2010regulation predicted lower problematic smartphone use. 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