This study investigated how often students used mobile phone to access various activities on Moodle. A survey on self-reported usage was filled by 252 university students in courses offered by four different faculties at the University of Hong Kong. Follow-up interviews were conducted to solicit students´ perceptions on mobile access to Moodle and the underlying reasons. The results show significant differences in students´ usage of various Moodle activities via mobile phones. Students´ responses also suggest that mobile access to Moodle is a necessary complement to computer access but its limitation on usability and reliability may have restricted its potential in enhancing teaching and learning.