The present study sought to investigate the effectiveness of online learning via smart phone on Iranian EFL learners' grammatical accuracy improvement. A number of 20 upper-intermediate male and female EFL learners selected as the population. The population selected from Pishtazan English Institute of Janah, a city in Hormozgan province of Iran. To achieve this aim, the researcher adopted the experimental approach. The researcher chose two groups of the upper intermediate learners: one group

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... sisting of (10) students was used as an experimental group and the other also consisting of (10) students was used as the control group. The traditional method was used in teaching grammar to the control group, while the online classroom was used to the experimental group. To analyze the data the frequencies and percentage of each item in the questionnaires computed with the aid of SPSS. The findings showed that there were significant differences between the experimental and the control groups and the experimental group who use online classroom had better performance. The finding of this study is to support the implement of useful ideas and new materials into Iran curriculum and teaching policies to benefit from the boring technologies in the Iran context.