The presented article provides an overview of related literature on the subject of mobile security. The issue was selected as a result of the increase in mobile applications and the underdeveloped discussion surrounding the security of those applications. Cell phones and tablets with mobile operating systems are regarded as mobile devices for the purposes of this essay. More specifically, these are BlackBerry OS (RIM)., iOS, and Android from Google, respectively Even though it's crucial to understand these concepts, the security flaws in the Android OS are the main subject of this literature review. Malware that changes to be somewhat different from the previous version is referred to as polymorphic. Although the malware's functioning is unaffected by the automated code changes, they may make traditional anti-virus detection technologies ineffectual.