Embodiments enable a mobile device to execute an action analogous to a user-defined action in response to receipt of a gesture analogous to a user-defined gesture. In a first embodiment, a computer-implemented method executes an action on a mobile device. A lock screen view is displayed on the mobile device to prevent unauthorized and inadvertent access to the mobile device's data. While the mobile device is locked, a touch gesture having a pre-defined shape is detected on a touch screen of the mobile device independently of the initial position of the touch gesture on the touch screen. In response to detection of the touch gesture, a particular action is executed on the mobile device while the mobile device stays locked. The particular action determined according to the pre-defined shape. In this way, detection of the touch gesture causes the particular action to execute while keeping the mobile device locked.