A method for configuring a mobile terminal to control vehicle functions of a vehicle, wherein the mobile terminal and the vehicle each have a short-range radio system, wherein the mobile terminal is configured to provide secure cryptographic proof of its identity, and wherein the mobile terminal is a near-field communication device (NFC device), the method comprising: reading out an identifier of a secure element of the NFC device by an app of the NFC device; transmitting the identifier of the secure element of the NFC device from the app to a backend service in order to perform an addition of a vehicle key to the NFC device in the backend service; receiving, by the backend service, a message to add the vehicle key, for use of vehicle functions of the vehicle, to the NFC device; determining, by the backend service, the vehicle key, for use of the vehicle functions, from a key database; transmitting a message for installation of a security domain on the secure element of the NFC device to a service of a manufacturer of the NFC device; installing the security domain on the secure element of the NFC device by the service of the manufacturer of the NFC device; transmitting a key for the security domain from the service to the backend service; establishing a secure communication channel to the secure element of the NFC device by the backend service with use of the key of the security domain; transmitting a key use and the vehicle key via the secure communication channel to the secure element of the NFC device from the backend service; storing the key use and the vehicle key in the secure element of the NFC device; sending the cryptographically secured identity to the vehicle by the NFC device; sending the vehicle key by the NFC device to the vehicle with use of a direct communication within the NFC device, wherein the secure element and the short-range radio system of the NFC device for direct communication are connected in such a way that software which is variable without physical connection to the NFC device cannot influence the communication; verifying the vehicle key by the vehicle; and if the vehicle key is verified successfully by the vehicle: executing a vehicle function of activation of a vehicle locking system. reading out an identifier of a secure element of the NFC device by an app of the NFC device; transmitting the identifier of the secure element of the NFC device from the app to a backend service in order to perform an addition of a vehicle key to the NFC device in the backend service; receiving, by the backend service, a message to add the vehicle key, for use of vehicle functions of the vehicle, to the NFC device; determining, by the backend service, the vehicle key, for use of the vehicle functions, from a key database; transmitting a message for installation of a security domain on the secure element of the NFC device to a service of a manufacturer of the NFC device; installing the security domain on the secure element of the NFC device by the service of the manufacturer of the NFC device; transmitting a key for the security domain from the service to the backend service; establishing a secure communication channel to the secure element of the NFC device by the backend service with use of the key of the security domain; transmitting a key use and the vehicle key via the secure communication channel to the secure element of the NFC device from the backend service; storing the key use and the vehicle key in the secure element of the NFC device; sending the cryptographically secured identity to the vehicle by the NFC device; sending the vehicle key by the NFC device to the vehicle with use of a direct communication within the NFC device, wherein the secure element and the short-range radio system of the NFC device for direct communication are connected in such a way that software which is variable without physical connection to the NFC device cannot influence the communication; verifying the vehicle key by the vehicle; and if the vehicle key is verified successfully by the vehicle: executing a vehicle function of activation of a vehicle locking system.