Mobile devices are ubiquitous both inside and outside the classroom, but their potential for personalised education has yet to be realised. Mobile interventions can improve students’ learning and well-being and at the same time advance researchers’ understanding of educational processes. In this presentation, I will provide an overview of the promises of mobile technologies for educational research that go beyond the provision of learning materials on mobile devices (m-learning). These promises include 1) the ability to intervene just in time, 2) to estimate causal effects of interventions in ecologically valid settings, and 3) to consider the impact of context on the effectiveness of interventions. I will then present empirical examples that illustrate how mobile technology can be used to employ innovative, intra-individual research designs that offer new perspectives on the effectiveness of educational interventions.