The invention relates to a method for accessing MNP data, which is stored in an MNP memory in a mobile radio network, by a network-external data processing device. The network interface, which in terms of signal flow is arranged between the network-external data processing device and the MNP memory, checks whether the network-external data processing device is authorized to access the MNP data. If the authorization is present, an identification for a communication terminal is transmitted by the network interface from the network-external data processing device to the MNP memory, MNP data which is associated with the communication terminal is read from the MNP memory, and this MNP data is transmitted via the network interface to the network-external data processing device.