This study examined the relationship between the big five personality traits and smartphone problematic use among University of Jos undergraduate students. 200 participants who own and use smartphones, comprising 82 males (41%) and 118 females (59%), and aged between 21 and 35 years drawn through convenience sampling method took part in the study. Two instruments were used to measure the variables in the study - the Problematic Use of Mobile Phones (PUMP) scale measured smartphone problematic use, whereas the Big Five Inventory (BFI) measured the Big Five Personality traits. Hypotheses were tested using the Pearson Moment Correlation Tool through the SPSS version 26 at 0.05 level of significance. Results revealed that extroverts, r (198) = 0.143; p= 0.043, experience smartphone problematic use. However, agreeableness, conscientiousness, neuroticism and openness to experience were not positively correlated with smartphone problematic use. A number of recommendations were advanced, including that clinicians educate, assess, and help extroverts manage the urge to use their smartphones excessively; laws guiding usage while at work or school be promulgated by policy makers, and further larger population of study be used to ascertain the veracity or otherwise of claims of this study.