Abstract: A computer-implemented method for automatically detecting a fraud call. A call request is received from a caller device to initiate a voice call with a called device at a local Public Land Mobile Network (PLMN). The call request is identified originating from a foreign Public Land Mobile Network (PLMN). In response to detecting that a caller ID of the caller device is associated to a local Public Land Mobile Network (PLMN), current location information is requested from a database of the local Public Land Mobile Network (PLMN). If the location information indicates the caller device is attached to the foreign Public Land Mobile Network (PLMN), determining the call request as authentic; and if the location information indicates the caller device is attached to the local Public Land Mobile Network (PLMN), determining the call request as fraud.

Abstract: According to an aspect, there is provided an apparatus for selective mobile operator call setup comprises means for performing the following. The apparatus maintains, in a database, subscriber information of a mobile operator. The subscriber information comprises, for each of a plurality of mobile subscribers, a phone number of a mobile subscriber and one or more predefined exception criteria for allowing incoming international calls. The apparatus receives a call setup request for an incoming international call. The apparatus determines phone numbers of calling and called parties. The apparatus searches the database based on the phone number of the called party. In response to finding subscriber information of the called party, the apparatus determines whether the phone number satisfies the one or more predefined exception criteria. In response to the phone number failing to satisfy the one or more predefined exception criteria, the apparatus blocks the incoming international call.

Abstract: A computer-implemented method for automatically detecting a fraud call. A call request is received from a caller device to initiate a voice call with a called device at a local Public Land Mobile Network (PLMN). The call request is identified originating from a foreign Public Land Mobile Network (PLMN). In response to detecting that a caller ID of the caller device is associated to a local Public Land Mobile Network (PLMN), current location information is requested from a database of the local Public Land Mobile Network (PLMN). If the location information indicates the caller device is attached to the foreign Public Land Mobile Network (PLMN), determining the call request as authentic; and if the location information indicates the caller device is attached to the local Public Land Mobile Network (PLMN), determining the call request as fraud.