Abstract: A mobile device capable of automatically switching its operation modes includes a storage module, a control module, a display module and an electrical connector. The storage module is configured to store data of icons controllable to execute an application or function. The control module is configured to direct the data of at least one icon from the storage module to be transmitted to the display module for displaying the icon on a screen. When the control module detects that the electrical connector is electrically coupled to an electronic device, the control module is configured to adjust configuration of the at least one icon, with the adjusted configuration to be automatically displayed on the screen to mark a new operation mode of the mobile device. The configuration of the icon may be adjusted in size, one or more pixels, position, or quantity of the icon.