Methods, apparatus, and products are disclosed for altering behavior of a multimodal application based on location. The multimodal application operates on a multimodal device supporting multiple modes of user interaction with the multimodal application, including a voice mode and one or more non-voice modes. The voice mode of user interaction with the multimodal application is supported by a voice interpreter. Altering behavior of a multimodal application based on location includes: receiving a location change notification in the voice interpreter from a device location manager, the device location manager operatively coupled to a position detection component of the multimodal device, the location change notification specifying a current location of the multimodal device; updating, by the voice interpreter, location-based environment parameters for the voice interpreter in dependence upon the current location of the multimodal device; and interpreting, by the voice interpreter, the multimodal application in dependence upon the location-based environment parameters.