Patent ID: 7706791

Claim:
A telecommunication method, for logging a subscriber into a visited partner communication network (VPMN), an identification module (SIM) being connected to the communication terminal of the subscriber, in which identification module (SIM) a first subscriber identification (IMSI-F) is stored, which lies outside the number range of the visited partner communication network (VPMN), the method comprising: transmitting a second subscriber identification (IMSI-T), from the number range of the visited partner communication network (VPMN), from a computerized service unit, outside the visited partner communication network, to the communication terminal in the visited partner communication network (VPMN); storing the second participant identification (IMSI-T) in the identification module (SIM) while the communication terminal is in the visited partner communication network; and logging the subscriber into the visited partner communication network (VPMN) using the second subscriber identification (IMSI-T).