Method for modifying the service quality associated with a telecommunication terminal for use of the telecommunication terminal with a telecommunication network, wherein the method comprises the following method steps: - in a first method step during use of the telecommunication terminal with the telecommunication network, a first item of service grade information emitted by the telecommunication network and corresponding to a first service quality is received by the telecommunication terminal and the first service quality is applied, - in a second method step chronologically subsequent to the first method step, - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is transmitted from the telecommunication terminal to the telecommunication network or - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is generated in the telecommunication network during the first method step on the basis of use of the telecommunication terminal according to a service use pattern indicating the customer satisfaction, - in a third method step chronologically subsequent to the second method step, a second item of service grade information emitted by the telecommunication network and corresponding to a second service quality is received by the telecommunication terminal and the second service quality is applied, wherein the second service quality corresponds to a service quality modified with respect to the first service quality, wherein the modification of the service quality is carried out in dependence on the customer satisfaction information. - in a first method step during use of the telecommunication terminal with the telecommunication network, a first item of service grade information emitted by the telecommunication network and corresponding to a first service quality is received by the telecommunication terminal and the first service quality is applied, - in a second method step chronologically subsequent to the first method step, - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is transmitted from the telecommunication terminal to the telecommunication network or - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is generated in the telecommunication network during the first method step on the basis of use of the telecommunication terminal according to a service use pattern indicating the customer satisfaction, - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is transmitted from the telecommunication terminal to the telecommunication network or - an item of customer satisfaction information relating to the service quality and/or the customer satisfaction is generated in the telecommunication network during the first method step on the basis of use of the telecommunication terminal according to a service use pattern indicating the customer satisfaction, - in a third method step chronologically subsequent to the second method step, a second item of service grade information emitted by the telecommunication network and corresponding to a second service quality is received by the telecommunication terminal and the second service quality is applied, wherein the second service quality corresponds to a service quality modified with respect to the first service quality, wherein the modification of the service quality is carried out in dependence on the customer satisfaction information.