A mobile voice platform for providing a user speech interface to computer-based services includes a mobile device having a processor, communication circuitry that provides access to the computer-based services, an operating system, and one or more applications that are run using the operating system and that utilize one or more of the computer-based services via the communication circuitry. The mobile voice platform includes at least one non-transient digital storage medium storing a program module having computer instructions that, upon execution by the processor, receives speech recognition results representing user speech that has been processed using automated speech recognition, determines a desired computer-based service based on the speech recognition results, accesses a remotely-stored service interface associated with the desired service, initiates the desired service using the service interface, receives a service result from the desired service, and provides a text-based service response for conversion to a speech response to be provided to the user.