In the case of mobile users (AMO-PERSI:PINTYPE=MOBILE), the home station (or virtual home station) stores the number of the foreign station at which the mobile user last logged in. This information is used to signal incoming calls or messages to the user's mailbox at the "foreign" station as well. This parameter also enables the follow-me functionality for call forwarding from the user's home station to the foreign station. If a mobile user logs in at a new foreign station without deactivating his PIN at the previous station, the first activation is deleted, i.e. it is only possible for a user's PIN to be active at one station at a time.