Mobile learning has become one of the more influential aspects in the field of educational technology given the ubiquity of modern mobile devices and proliferation of educational applications or 'apps' for mobile devices. Within this special issue, there are a range of studies and reviews which cover a breadth of current topics in the field, namely user motivations for using mobile learning, issues in evaluation and domain-specific considerations (e.g., use within language learning or audio-based applications). Together these studies represent the synthesis of a range of methods, approaches and applications that highlight benefits and areas of future growth of mobile technologies.