Touch-less user interface for mobile devices that uses a voice sensing technology enabling voice detection and actuation. It enables devices to continuously listen to their surroundings, and act upon a simple, configurable voice command using a voice activity detector (VAD). The incoming voice signal is compared to pre-stored key phrases or triggers. Users can personalize their mobile device by selecting a personal wake-up trigger. VoiceQ can be applied to all major spoken languages with appropriate language modeling.