A user interface (UI) for use with a secondary display module of a mobile electronic device. The UI allows the user to access application data without activating the operating system (OS) of the main portion of the mobile electronic device. The UI can allow the user to access application data by activating the OS and an associated low-power application without launching the application. The UI also provides a simple mechanism to disable wireless components of the mobile electronic device while allowing the user to use other non-wireless components. The secondary display module can be detached from a main portion of the mobile electronic device, with the UI being automatically activated. The UI can be automatically activated (or deactivated) in response to deactivation (or activation) of the UI of the main display of the mobile electronic device.