A digital telecommunications system communicates with an unstructured supplementary service data protocol by a digital application located on a mobile terminal. The digital application includes a navigation module, a presentation module, an interpreter module and an encryption module. The digital application interprets data received from an unstructured supplementary service data protocol that communicates with a telecommunications network and displays interpreted data on a screen of said mobile terminal from data received from the unstructured supplementary service data protocol. The digital application interprets a request of a user entered into the mobile terminal in response to the interpreted data displayed on the screen of the mobile terminal, and sends from the mobile terminal data interpreted from the request of the user to the telecommunications network by the unstructured supplementary service data protocol.