Mobile learning offers several advantages over other forms of learning like ubiquity and idle time utilization. However for these advantages to be properly addressed there should be a check on the system quality. Poor quality systems will invalidate these benefits. Quality estimation in M-learning systems can be broadly classified into two categories: software system quality and learning characteristics quality. In this work, a M-Learning frame work is first developed. Software System quality is then evaluated following the ISO/IEC 25010 Software Quality model by proposing a set of metrics which measure the characteristics of a M-Learning systems. The applications of these metrics were then illustrated numerically.