The present disclosure relates to a method performed by a mobile device for facilitating inputting a command to a service application in the mobile device. The mobile device comprises an inertial measurement unit (IMU). The method comprises determining a time interval in which a user of the mobile device will agitate the mobile device in accordance with a command. The method also comprises filtering an information feed from the IMU during said time interval to remove signals which are outside of a predetermined spectrum and thus regarded as noise. The method comprises finding distinguishable signals within the filtered feed, said distinguishable signals forming a command pattern. The method comprises associating the command pattern with the command.