Embodiments disclosed herein provide systems and methods that allow a mobile device to fully access unified communication services. In a particular embodiment, a mobile device receives a user input indicating a destination identifier for a call and processes the destination identifier to determine whether the destination identifier is associated with a unified communication service. If no, the mobile device connects the call. If yes, the mobile device generates and transfers a text message indicating that the mobile device is requesting the service to an intermediate communication system in a first carrier network. The intermediate system receives and processes the text message to determine a first portion of the service that is associated with the mobile device. The intermediate system initiates the call to the mobile device to connect the mobile device with a unified communication system via the intermediate system and provides the first portion of the service.