This study attempts to find out overall aspects that have been considered in various mobile learning researches and projects. A systematic review of literature was carried out on the mobile learning domain that emphasized on scale, purposes, methods and type of used m-learning applications as well as school levels they have been implemented. Engagement of students, just-in-time learning were among the most frequently considered issues for selecting instructional methods in m-learning projects while inquiry-based learning is the most common method of instruction which is followed by game-based learning. It is revealed that cellphones and smartphones were the most frequently used devices for applying m-learning while m-learning has been considered dominantly for K12 environments rather than higher education. (C) 2015 The Authors. Published by Elsevier Ltd.