In this study, both qualitative and quantitative methods of data collection were used to investigate the effectiveness of using two vocabulary techniques, i.e. m-learning and flashcards, on the level of vocabulary learning of EFL students. New vocabularies were taught to the students in the experimental group (those who used m-learning) and the control group (those who used flashcards) within a 7-week period. The SRS (Spaced Repetition System) vocabulary acquisition program was selected to be used as the Mobile software for this study. The required vocabularies were scanned and inserted into the system and then the program was used as the main software for teaching the new vocabularies. It is also important to note that in addition to this software, ShortMessage Services (SMS) and the Internet were used where the teacher thought they would be necessary and helpful for vocabulary learning. The control group used only the paper flashcards during the seven weeks of the study. Some of the covered topics were sports, entertainment, going abroad and favourite hobbies. During these seven weeks about 1200 new words were introduced to the students.