Various arrangements for selecting a function to be executed on a mobile device are presented. A processor may receive proximity data that indicates the mobile device is proximate to a user. The processor may receive acceleration data that indicates a direction of acceleration. In response to receiving the proximity data indicating that the mobile device is proximate to the user, the processor may identify a position of the mobile device in relation to the user using the acceleration data. In response to identifying the position of the mobile device in relation to the user using the acceleration data, the processor may select a function to be executed.