The aim of this study is to examine K12 students' preferences and attitudes on mobile learning. In this study, causal-comparative method was used. The sample of the study were 236 students (127 females, 109 males) at K12 level. The students are enrolled in primary (n=104), secondary (n=77), and high school (n=55) levels. The data in the study were collected through a questionnaire. According to the results, watching videos, playing music, playing games, taking a picture, accessing the Internet are the most common uses of mobile devices for the students. The students' attitudes towards mobile learning is highly positive. The male students' perceived ease of use towards mobile learning is higher than females. The secondary and high school students' perceived ease of use is higher than primary school students. Moreover, the high school students' desire for learning is higher than the others. Implications were discussed in terms of practices for mobile learning in K12, and directions for further research.