Cell phone learning (C-learning), as an instructional approach, has been gaining more and more attention in the field of teaching English as a foreign language (EFL) in the last 10 years. While studies have proved C-learning an effective instructional approach in research settings, a review of literature indicates the lack of design principles to guide the design and development of C-learning activities, not to mention the principles specifically for EFL teaching. The effectiveness of C-learning depended on appropriate activity design (Librero, Ramos, Ranga, Trinona, & Lambert, 2007; Prensky, 2005). The purpose of this article is to propose a combined task-based learning approach to guide the design of C-learning activities for EFL teaching. A sample learning activity is also provided to illustrate the suggested principles.