Recognizing the risks of pervasive low adult literacy levels amongst Canadians and globally, our research project aims to design a mobile learning solution to support literacy training for adult learners in a blended learning context. This mobile solution will equip them with language and digital literacy skills needed to thrive in their communities and workplaces. This paper offers preliminary results of this research project investigating design principles for an adult literacy mobile learning solution. It provides definitions for design principles and guidelines. The paper also identifies, briefly discusses, and provides examples of the three key themes from the reviewed literature and interviews with experts during the Informed Exploration process in Phase 1 of this project.