Display of supplemental content on a smartwatch wearable mobile device. A method establishes, on supplemental physical display plane(s) of a smartwatch wearable mobile device, virtual display plane(s). The smartwatch includes a primary physical display plane and the supplemental physical display plane(s). The supplemental physical display plane(s) at least partially surround the primary physical display plane. The method displays primary content on the primary physical display plane and supplemental content on the virtual display plane(s). The method also receives touch sensor input from a touch sensor of the smartwatch and maps the touch sensor input to interface element(s) of the supplemental content on the virtual display plane(s). The method selects the interface element(s) based on the mapping the touch sensor input to the interface element.