Abstract
Smartphones have an essential role in day-to-day lives. Mobile phone applications have several and wide ranging features. The use of these smartphone applications provides new insights for innovation and opportunities in language teaching and learning process. The present study intended to examine the efficiency of a mobile application on teaching 40 phrases from Nation and Martinez phrase test 1-5 compared to conventional activities. Quasi-experimental research design with pre-test and post-test was employed to determine the differences between the scores of the control group (N=20) and the experimental group (N=20) developed by using random sampling. Results indicated that participants in the experimental group performed significantly better in the post-test, demonstrating the effectiveness of the mobile application used in this study on learning idioms. The results showed that learners in the experimental group achieved considerably better development in the post-test, representing the efficiency of the smartphone application that was involved in the study. Suggestions have been given for using mobile phone applications more effectively for vocabulary learning.