The continuous advancement of financial technologies in the realm of Islamic banking and finance is influenced by the spread of banking digitalization. The digitalization of banking is undeniably related to the expansion and dependency on the use of the Internet among the customers. Instead of depending on physical location, Islamic banks nowadays have ample chances to engage and communicate with their customers through this current online banking platforms. In order to ensure their consistent follow-up with the latest digital transformation, Islamic banks must be ready to adopt the new technology, ready to shift their costs of services to the online applications, and reconsider their corporate structures. Focusing on the application of mobile banking as a prominent part of banking digitalization among Malaysian Islamic banks, it is important to consider their customers’ concerns relating to its usages. Thus, this research focuses (1) on explaining the understanding of what is considered as a mobile banking and its usages among Malaysian Islamic banks and (2) evaluating the concerns among Islamic banks’ customers relating to the use of mobile banking in their daily activities. In doing this research, the researchers apply the qualitative research approaches and content analysis of obtained data from library based research. As part of the findings, it is identified that the customers’ concerns are related to their awareness, knowledge of using the mobile banking, trust toward the safety of their personal information or transactions, and the security of the mobile banking system
