Abstract: A Home Location Register (HLR) and an Interworking Gateway (IWG) of an operator are configured to redirect Mobile Originated Short Messages (MO SM) sent by roaming cellular communication devices of both prepaid and postpaid subscribers hosted by a foreign network to a real time charging gateway (RTCG). The RTCG retrieves from the operator's database the type of subscription of the sending device. If the device is of a postpaid subscription, the RTCG operates as a relay between an SMSC and the foreign network. If the device is of a prepaid subscription, the RTCG communicates with a PrePaid System (PPS) and forwards the MO SM to the SMSC only in case there are sufficient funds in the respective prepaid account.

Abstract: A Home Location Register (HLR) and an Interworking Gateway (IWG) of an operator are configured to redirect Mobile Originated Short Messages (MO SM) sent by roaming cellular communication devices of both prepaid and postpaid subscribers hosted by a foreign network to a real time charging gateway (RTCG). The RTCG retrieves from the operator's database the type of subscription of the sending device. If the device is of a postpaid subscription, the RTCG operates as a relay between an SMSC and the foreign network. If the device is of a prepaid subscription, the RTCG communicates with a PrePaid System (PPS) and forwards the MO SM to the SMSC only in case there are sufficient funds in the respective prepaid account.