The purpose of this study was to determine the effect of using smartphones for online learning on teachers' and students' interactions in learning that occurred during the COVID-19 pandemic. Respondents were 303 elementary school students, randomly selected by filling out questions through a Google form application. 20 items were provided, 10 items for the OLWS variable and 10 items for the TSI variable, which were adopted from several literature articles and adapted to the problem of this research. The data normality test was previously carried out and continued with testing the level of validity and reliability of the instrument, followed by evaluation of the structural model related to hypothesis testing using SPSS and SmartPL. The result determined by the PLS-SEM algorithm is 0.507, which is greater than the recommended value, indicating that the model has a reasonable level of justification for the variance in user behavior objectives. The only hypothesis (H1) is supported by the t-value of 15.399 (> 1.96) and a P-value of 0.000 (0.05), which indicates that OLWS has a positive and significant effect on TSI. Since the teacher's role in conveying knowledge to pupils demands specific, complex, and modern equipment that is widely available, easy to use, and follows technological changes, teachers and students can communicate appropriately, effectively, efficiently, and encourage quality results.