Patent ID: 7409210

Claim:
A method of controlling roaming in a mobile system comprising at least two networks, which can offer a roaming subscriber attached to the system a circuit-switched and/or a packet-switched connection; the method comprising: allowing or denying a subscriber's roaming in the mobile system, when the subscriber attempts to attach to the mobile system, on the basis of the subscriber's roaming right data, which data indicates if the subscriber is entitled to roam that particular mobile system, wherein at least two subscription type are definable for the subscriber, and the subscriber's roaming in each network of the mobile system that the subscriber attempts to attach to is allowed or denied separately on the basis of the subscriber's roaming right data, which data indicates if the subscriber is entitled to roam a particular type of network in that particular mobile system, and on the basis of data on the subscription types defined for the subscriber and on subscription types for which roaming is allowed in said mobile system, wherein when the subscriber attempts to attach to a network of the mobile system, the method comprises: checking from a network element comprising the subscriber's roaming right data if the subscriber is entitled to roam that particular type of network in that particular mobile system, performing a check from a network element comprising data on the subscription type defined for the subscriber and on subscription types for which roaming is allowed in said mobile system regarding said subscriber types to find out if roaming in said mobile system is allowed, and, on the basis of said checks, allowing or denying the subscriber's roaming in said network of the mobile system.