Mobile technology's ubiquity has caused a shift in how students learn and how pedagogy can take place. Educators have the potential to engage students more fully in the modern educational environment, by making learning content and interactions accessible via mobile devices, both within and outside of the classroom. There is a need to leverage the learning science literature on learner engagement to identify the most effective means of utilizing mobile and online technology to engage learners. Utilizing foundational engagement theory, this paper presents an Applied Model of Learner Engagement, including the individual, task and environmental factors that influence how likely a student is to become engaged in learning content. Based on this model, we present instructional interventions that educational practitioners can utilize to more effectively engage learners, as well as best practice guidance for achieving this, with mobile and online learning technology, in the modern educational environment.