Abstract: The invention relates to an application which is executable on a telecommunications terminal device (100) and which is configured to transmit a command which is invokable by said application (104) and which is suited to cause transmission of a message from said telecommunications terminal device (100) to a server (203), wherein said message is suited, after said message is received by said server (203), to initiate transmission of information relating to a credit which is available to a user of said telecommunications terminal device (100) by said server (203) to said telecommunications terminal device (100). The invention further relates to a telecommunications terminal device having a corresponding application, a data carrier device on which a corresponding application is stored and a corresponding method.

Abstract: The invention relates inter alia to a computer program (134) which is configured to implement a web service and which has an interface (137) via which a program component (135) is callable. The program component (135) is configured to cause transmission of information relating to a balance available to a user of a telecommunications terminal (110) by a server.