A digital telecommunications client-server system where a network server communicates by a protocol with a digital application located on a mobile terminal. The digital application includes a navigation module, a presentation module, a decoder interpreter module and a transport module. The digital application interprets data received from a network server located in a mobile core telecommunications network and displays interpreted data on a screen of the mobile terminal, with the interpreted data relating to a service or application. 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 user's request to the telecommunications network.