This study assessed attitude, anxiety, and technostress as a correlate of the use of mobile phones by undergraduate students in Delta State University (DELSU), Abraka. The total population for this study was 6,675 undergraduate students registered with the library of Delta State University in the 2019/2020 academic session. The instrument used for data collection was a structured questionnaire which was designed in print formats. A total number of 1001 copies of the questionnaire were distributed to the respondents with the aid of 5 research assistant and a total of 797 questionnaires was duly completed and found usable for the study. There was 80% return rate. The data collected for this study were analyzed using simple percentage and frequency counts. The finding revealed that the undergraduates have a positive attitude towards the use of mobile phones. The finding also revealed that the majority of the respondents experience a high level of anxiety in their use of mobile phones. The finding shows clearly that the undergraduate students in DELSU use mainly Android phones, iPhone, and Blackberry. The findings revealed that the major effects of anxiety relating to the usage of mobile phones as indicated by the respondents are poor concentration and lack of interest in their academics and other events. The findings also show that the major effects of technostress relating to the usage of a mobile phone as indicated by the respondents is that they feel worn out most times after using their mobile phone. It was recommended that university management offering internet access within campuses should block some sites students spend hours using for non-academic purposes, an example is gambling sites, and regular training should be conducted for undergraduates on how to use their phones for accessing information and for other academic purposes.