A mobile device having an internal frame and a sidebar configured to be coupled to the internal frame. The sidebar can include at least one button positioned in a button configuration on an exterior face of the sidebar and a sidebar contact positioned on an interior face of the sidebar. The sidebar can be positioned to interface with a frame contact when the sidebar is coupled to the internal frame. The frame can be operably coupled to a controller for a mobile device such that coupling the sidebar contact to the frame contact operably connects the at least one button of the sidebar to the controller. The sidebar can be exchanged with or decoupled from the frame and replaced with a second sidebar having a different button configuration from the original sidebar.