15. The mobile device of claim 14 , wherein the at least one indication to the user includes illuminating one or more light emitting diodes of the mobile device.
14. A mobile device comprising: at least one input to receive acoustic input from an environment of the mobile device while the mobile device is operating in an idle mode; a first processor to perform at least one first processing stage on the acoustic input to evaluate whether the acoustic input includes a voice command; a second processor to perform at least one second processing stage on the acoustic input to evaluate whether the acoustic input includes a voice command, and wherein the mobile device is configured to provide, prior to waking up the mobile device, at least one indication to the user to confirm that the acoustic input was received and is being processed, wherein the at least one first processing stage is performed prior to engaging the second processor, wherein the at least one second processing stage is performed if further processing is needed to determine whether the acoustic input includes a voice command, and wherein response to the voice command is initiated when either the at least one first processing stage or the at least one second processing stage determines that the acoustic input includes a voice command.