Abstract: Embodiments of methods for handling a service authorization request (SAR) from a mobile subscriber are disclosed. The SAR represents a request for access to a given prepaid mobile service. The method includes ascertaining, using suspect subscriber list, whether the SAR is associated a suspect subscriber in the suspect subscriber list. The method further includes authorizing, if the SAR is not associated with the suspect subscriber, the SAR without waiting until response-determinative processing is performed on the SAR.