Contrary to its rapid diffusion, m-learning is short of concrete theoretical underpinnings. This study serves as a first important step to apply self-directed learning theory to the m-learning field. Based on a review of both m-learning and self-directed learning theory literature, present study applies findings of prior self-directed learning research to portray current m-learning activities. Evidence is also found, suggesting that self-directed learning theory should be an important theoretical underpinning of m-learning. Based on a reflection on current m-learning initiatives, the paper suggests that, to design a sound m-learning system, a sufficient consideration of learners’ self-directed learning attributes is critical and essential.