The purpose of this study is to determine the effect of three different computer integration models on Turkish pre-service mathematics teachers’ beliefs about using computers in mathematics education. The results indicated a remarkable change in beliefs within the Exploring Mathematical Relationships with Mathematical Software (EMReMaS) and Integrated Model (IM) groups concerning computer use in teaching and learning mathematics. Another significant result is that the beliefs of the students in the IM group are statistically higher than the ones from the EMReMaS group. The author suggests that pre-service mathematics teacher education programmes should give their students opportunities to learn about mathematical software and relevant instructional technologies and opportunities to use these technologies and software to design and implement reform-based mathematics lessons.