ObjectivesFrom both variable-centered and person-centered perspectives, the present study aimed to examine the developmental trajectories of phubbing among Chinese adolescents and to investigate whether mobile phone usage duration was associated with overall growth patterns and heterogeneous trajectory membership.MethodsParticipants were 1,488 middle school students from Jiangxi Province, China. Data were collected across three waves at approximately four-month intervals. Phubbing was assessed u