The main objective of this work is to explore variables affecting customers’ retention of mobile fintech services based on Stimulus-Organism-Response theory of telecommunication sectors in Jordan. A quantitative approach was designed to serve the purposes of the study. Depending on Structural Equation Model (SEM), the results of this research uncovered that customers’ perceived value and security play an essential role in determining customers’ loyalty, engagement, and retention of using mobile fintech services of telecommunication companies in Jordan. The results also uncovered that customers’ loyalty and engagement have an ability to retain customers to accomplish their financial services practices based on mobile fintech services of telecommunication in Jordan. The present study has added a new theoretical and practical insight in fintech services domain, especially in telecommunication companies in Jordan. The outcomes of the hypotheses test could assist in developing mobile fintech services or producing new mobile fintech services of telecommunication companies in Jordan based on analyzing customers opinions.