The analysis of exam data confirms the significant and positive effect of smart phone usage in English teaching and learning in university classrooms. The effectiveness can be explained by the feature of instant feedback supported by the smart phone and the web-based CSIEC instruction system. The treatment enabled the students to get familiar with pronunciation, spelling, meaning and usage of the new words and phrases through participating in the drilling activities supported by the smart phones in the classroom and in the free time. As vocabulary is the basics of language skills including listening, speaking, reading and writing, the vocabulary improvement contributed to the students’ progress in comprehensive and regular exams. Thus the students from treatment class decreased their distance to the control class in regular exams on average from statistically significant level to not significant level throughout the experiment semester. Moreover, the fully participating students in the treatment class achieved significantly better grades than the partially participating students in the post regular exam, although two groups were almost the same in pre regular exam.