Mobile devices have become widely used in K-12 education settings for teaching diverse students. We comprehensively reviewed 11 studies published between 2005 and 2016 that examined the use of mobile devices for teaching K-12th grade English language learner students in the United States. We also examined the methodological quality of the studies. Results of the review indicated promising effects from using mobile devices for teaching K-12th grade students who are learning English. Using the devices for instruction led to improved learning, self-efficacy, and engagement and increased students' time with the academic content. Results of the review also indicated that additional studies are needed with improved methodological quality. We discussed directions for future research and implications for practice.