A method for installing an application on a mobile telecommunication device, wherein the mobile telecommunication device has a SIM card, wherein the SIM card has a SIM Application Toolkit, STK, wherein the method comprises: - transmitting the launch browser command of the STK from the SIM card to the mobile telecommunication device, wherein the launch browser command specifies a first URL, wherein the first URL is stored predefined on the SIM card, wherein the first URL refers immediately and directly to a first server in a network, wherein the first URL does not refer to the application to be installed, - once the launch browser command has been received by the mobile telecommunication device, requesting the first URL by a browser of the mobile telecommunication device via the network, - receiving the request of the first URL by the first server and converting the first URL into a second URL by the first server, wherein the second URL refers to the application, wherein the conversion of the first URL into the second URL occurs so that the conversion can be determined by the browser of the mobile telecommunication device, - determining the conversion by the mobile telecommunication device and, on the basis of this determination, requesting the second URL via the network by the browser of the mobile telecommunication device, wherein, on account of the request of the second URL, the mobile telecommunication device prevents the request and transmits the second URL to an Internet sales portal application of the mobile telecommunication device, wherein the Internet sales portal application is designed for the management of applications installed on the mobile telecommunication device, - requesting the second URL via the network by the Internet sales portal application, wherein, on account of the request of the second URL, the application is transmitted by the first server to the mobile telecommunication device via the network, - installing the application on the mobile telecommunication device. - transmitting the launch browser command of the STK from the SIM card to the mobile telecommunication device, wherein the launch browser command specifies a first URL, wherein the first URL is stored predefined on the SIM card, wherein the first URL refers immediately and directly to a first server in a network, wherein the first URL does not refer to the application to be installed, - once the launch browser command has been received by the mobile telecommunication device, requesting the first URL by a browser of the mobile telecommunication device via the network, - receiving the request of the first URL by the first server and converting the first URL into a second URL by the first server, wherein the second URL refers to the application, wherein the conversion of the first URL into the second URL occurs so that the conversion can be determined by the browser of the mobile telecommunication device, - determining the conversion by the mobile telecommunication device and, on the basis of this determination, requesting the second URL via the network by the browser of the mobile telecommunication device, wherein, on account of the request of the second URL, the mobile telecommunication device prevents the request and transmits the second URL to an Internet sales portal application of the mobile telecommunication device, wherein the Internet sales portal application is designed for the management of applications installed on the mobile telecommunication device, - requesting the second URL via the network by the Internet sales portal application, wherein, on account of the request of the second URL, the application is transmitted by the first server to the mobile telecommunication device via the network, - installing the application on the mobile telecommunication device.