An interchangeable covering for a mobile electronic communication device (mobile device) includes an electronic component having a switch unit, a personalization unit and an interface unit. The switch unit includes key(s) that are accessible to the user when the covering is fitted to the mobile device. The personalization unit stores information such as music data files, audio ring files, screen animation files, data files (e.g., telephone numbers, email addresses, URLs, radio channels, etc.) and/or instructions that can be executed by a processor in the mobile device. The user can use the switch unit to access the information in the personalization unit. The personalization unit interacts with the electronics of the mobile device via the interface unit.