This literature review summarizes 103 studies on the use of mobile learning (mLearning) for adult and post-secondary education published between 2005-2012. The studies focused on: 1) how mobile devices expand teaching and learning beyond the classroom; 2) using mobile devices to support content learning in subjects like languages and sciences; and 3) user perceptions of mobile learning. The review found mLearning is still nascent with no unified learning theories. It calls for more rigorous longitudinal studies with larger samples specifically examining learning gains. It also notes a lack of standardized terminology.