A method of operating a wearable display device comprising a processor coupled to a touchscreen display and memory, comprising: receiving inputs corresponding to contact gestures on the wearable display device, the wearable display device including an interactive touchscreen display and having a display area of less than 6.35 X 10 -2 m (2.5") diagonal, wherein the wearable display device does not have a button for controlling the wearable display device; responsive to the display device being removably inserted into a receptacle of a case of an accessory, detecting a shape of the case and automatically reconfiguring the interactive touchscreen display to arrange and format the said display according to the shape of the case; automatically adjusting the input touchscreen contact gestures to accommodate the display shape and function; determining whether the input corresponds to a contact gesture type, wherein the contact gesture type is at least one of a primary contact gesture, a secondary contact gesture, a tertiary contact gesture, and a universal contact gesture; and performing function corresponding to the contact gesture type; wherein each primary contact gesture is mapped to a first function of at least one operational mode in a plurality of operational modes; each secondary contact gesture is mapped to a second function of at least one operational mode in the plurality of operational modes that is used less than the first function; each tertiary contact gesture is mapped to a third function of at least one operational mode in the plurality of operational modes that is used less than the second function; and each universal contact gesture is mapped to a function in all operational modes, wherein inputting a universal contact gesture causes the electronic data and communication device to invoke the specific function to which the universal contact gesture input by the user is mapped in all operational modes. receiving inputs corresponding to contact gestures on the wearable display device, the wearable display device including an interactive touchscreen display and having a display area of less than 6.35 X 10 -2 m (2.5") diagonal, wherein the wearable display device does not have a button for controlling the wearable display device; responsive to the display device being removably inserted into a receptacle of a case of an accessory, detecting a shape of the case and automatically reconfiguring the interactive touchscreen display to arrange and format the said display according to the shape of the case; automatically adjusting the input touchscreen contact gestures to accommodate the display shape and function; determining whether the input corresponds to a contact gesture type, wherein the contact gesture type is at least one of a primary contact gesture, a secondary contact gesture, a tertiary contact gesture, and a universal contact gesture; and performing function corresponding to the contact gesture type; wherein each primary contact gesture is mapped to a first function of at least one operational mode in a plurality of operational modes; each secondary contact gesture is mapped to a second function of at least one operational mode in the plurality of operational modes that is used less than the first function; each tertiary contact gesture is mapped to a third function of at least one operational mode in the plurality of operational modes that is used less than the second function; and each universal contact gesture is mapped to a function in all operational modes, wherein inputting a universal contact gesture causes the electronic data and communication device to invoke the specific function to which the universal contact gesture input by the user is mapped in all operational modes.