Information flow has increased significantly due to globalization and technological advancement, which has resulted in Bring Your Own Device (BYOD). This phenomenon has necessitated all sectors to adapt to the changes and align themselves with technology in order to maximize the benefits. The banking sector, in particular, has been at the forefront of the adoption of BYOD. However, this adoption of BYOD makes the banking sector vulnerable to various security threats. Ofusori, Dlamini, and Prabhakar (2018) classified these threats within technical, social and mobility domains. This article focuses on and investigates the influence of threats related to technical and mobility domains within a BYOD environment. Data were collected from employees of four banks in Nigeria to assess individual practices. The study found threats that overlap both technical and mobility domains and the existing security measures were found to be inadequate to alleviate those overlapping threats. As a result, this study recommends possible solutions to limit these security threats. In addition, this study contributes to the current theoretical perspectives concerning the use of mobile devices, therefore contributing to the existing body of knowledge regarding security threats for banks.