<p>The study aims to explore how retail investors’ decisions are affected by nomophobia, the fear of losing access to mobile phones. It specifically examines the impact of investor-related fear of missing out (I-FoMO), a variant of the general fear of missing out (FOMO) in the context of Indian financial markets. Using a survey approach, the research investigated the effects of being without a cell phone on financial anxiety, the fear of missing crucial market information, and the financial literacy required for investment decisions. The study involved 325 retail investors surveyed through a Likert scale-based questionnaire, employing quantitative descriptive research methods. Data analysis was performed using SmartPLS version 3.3.2 and Partial Least Squares Structural Equation Modeling (PLS-SEM), with path analysis used to identify key variables influencing investment decisions. The results indicated that retail investors are prone to overtrading when they fear missing out on financial information or when smartphone access is inconvenient. I-FoMO was found to significantly mediate the relationship between nomophobia and investment decisions. This research offers a novel perspective to behavioral finance theories by integrating smartphone information-sharing dynamics and media studies into understanding investment decisions. It introduces a new scale for I-FoMO and validates the NoMoPhobia Questionnaire, enhancing insights into how fear and anxiety impact investor behavior and highlighting the moderating role of financial literacy.</p>