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The revolution of mobile phones era has brought the innovative smartphones technology. As a result, research addressing information access in smartphones environment has proliferated. The important feature of smartphones is to restrict the behavior of users using applications and services to a certain level and the existing access control mechanism on smartphones mostly holds a coarsegrained. To enhance this into fine-grained manner, it is practical to use context-related information to specify what resources and services an application should be authorized access to. This paper proposes a finer access control mechanism which is context-related role based access control (CtRBAC). CtRBAC is based on traditional role based access control by incorporating with the contextual information of user and system environment. CtRBAC categorizes the mobile phone users according to their access rights of device's resources and services. By using simple policy and context, the system fulfills necessity of existing access control mechanism.