Despite the increasing importance of mobile devices in education, the essential features of these devices for ubiquitous learning have not been empirically addressed. This study empirically investigated the necessary conditions for using mobile devices as an educational tool for ubiquitous learning in higher education by a conjoint method. The results show that respondents want to use Window-based large-screen devices for their educational purposes; thus, current tablet PCs might not be suitable in terms of screen size and type of platform. The findings also implied that potential users want to receive ubiquitous access by using advanced cellular networks, but they do not need comprehensive functions related to office documentation on their mobile devices. Therefore, this study suggests that both policy makers and business players consider developing the optimal educational mobile device as soon as possible for the successful dissemination of ubiquitous learning. (Contains 3 tables.)