The aim of this research was to investigate the effect of mobile learning on students' academic achievements and their opinions about the course. This research was a mixed study where both quantitative and qualitative methods were used together. The quantitative part of the study used quasi-experimental models in a pre-test/post-test design according to the patterned paired control group. In the qualitative part, a semi-structured interview method was used from descriptive models. The study group consisted of 28 students studying in the 8th grade of a state secondary school in the Pasinler district of Erzurum Province of Turkey in the 2018-2019 academic years. The study lasted approximately 6 weeks. As a result of the study, it was observed that there was a positive increase in academic achievement in favor of the experimental group of students. Moreover, although there were differences of opinion among the students, a large majority declared that the mobile supported learning increased their interest towards the course. Recommendations are made based on this research.