This research examines the information security of adopting mobile banking and suggests maximizing information security in mobile banking in different ways. Security issues pose a threat to mobile banking adoption and diffusion. Therefore, reliable security measures and improved trust improvement are suggested to address information security in adopting mobile banking for financial services. A questionnaire survey is conducted with users of mobile banking technology. Random sampling is adopted in the study. 650 questionnaires were sent to respondents, and 303 responses were recorded. A confirmatory factor analysis with varimax rotation was conducted following correlation and multiple regression analysis to test the hypothesis of the study. The research finds that (1) perceived security and trust affect mobile banking self-efficacy and performance (SEP) of adopting mobile banking for financial services; (2) Reliable security measure and perceive trust improvement positively influence (SEP) of adopting mobile banking for financial services. This study shows the significance of user perceptions of security by inspecting the content of the security rules of mobile banking for clients’ levels. It includes the adoption of technology in financial services. Therefore, the study links the technology acceptance model (TAM) with the literature on perceived security and trust of adopting mobile banking for financial services. The research has applied to the banking industry to develop and expand its banking market by developing reliable security measures and improving the perceived trust of customers to conduct banking transactions using mobile banking technology.