Increasing breastfeeding rates around the world is one of the most important goals of the World Health Organization. This study was conducted to investigate the impact of smart phone-based education and regular delivery of designed messages on breastfeeding self-efficacy in primiparous mothers. Methods: This study was an educational intervention in which 120 primiparous breastfeeding mothers were randomly allocated into two groups from March 2018 to March 2019. The control group received

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... counseling interventions and the intervention group received a smart phone messaging program. We collected the data using demographic questionnaire and Dennis short form breast feeding questionnaire. Self-efficacy levels were compared in the two groups before and after the study procedures. We analyzed the data utilizing Student t-test, chi square, and one way – ANOVA. Results: In this study, 60 mothers were studied in each group, and then the collected data were analyzed. The mean posttest scores in the intervention group (60.40±4.92) and the control group (50.10±7.60) were compared. The results indicated a statistically significant difference between the groups (P<0.001). Working mothers and mothers with a higher level of education had significantly higher self-efficacy score following the intervention (P=0.04 and P=0.05, respectively). Conclusion: Breastfeeding counseling through text, audio, and video messages may increase maternal self-efficacy, particularly in high educated mothers and working ones.