Media, methods and interfaces are provided for interfacing a mobile device and an application virtual machine to provide location information of the mobile device from a secondary source. When location information supplied by a first source to the application virtual machine contains invalid values for device location, a secondary source is utilized to provide the location information. No new processing thread is spawned for collection of back-up source configurations. Thus, interfaces initiate the first and second location determination methods in a single request. The power consumed by the mobile device to retrieve the device location information from a secondary source is reduced by the absence of additional configuration collection threads. Interfaces include a primary location component, a verification component, a backup location component, and a location update component.