Mobile teaching and learning in higher education is approaching a tipping point. One of the most significant promises of mobile learning is the ability for faculty members, teachers, and students to use their own mobile computing devices. In the US, 75% of American teens have cell phones and almost 30% have smartphones with Internet capabilities. In universities, the numbers appear to be much higher. It seems instructionally sound and fiscally prudent for institutions and faculty members to leverage the existing devices in which students are most comfortable. The purpose of this paper is to (1) critically examine the definitions and affordances of mobile learning in higher education, (2) identify the ways mobile teaching and learning have been and could be accomplished in higher education, (3) identify the challenges to implementing mobile teaching and learning in higher education.