How can teachers be inspired to integrate technology properly into their teaching? As technology has been playing a more crucial role in classrooms, it is highly necessary to investigate how teachers perceive the benefit of technology and feel confident to use it. The present study focused on teachers' self-efficacy and belief regarding mobile computing devices. To investigate the relationship among self-efficacy, belief and technology integration, we administrated a survey to teachers (N = 57) in middle schools adopting one-to-one technology initiatives. Results showed that teachers' self-efficacy toward mobile technology predicted the integration of the technology. Teachers' belief had a positive relationship with, but did not predict, technology integration. Factors related to teachers' self-efficacy and belief were discussed.