A method and system for streamlining the call processing for a prepaid call in a mobile telecommunications network is provided. A trigger detection point (TDP) for processing an originating call placed by a prepaid wireless subscriber, which may be called “O-Answer,” is defined in a mobile user's subscription information stored in the prepaid subscriber's home location register (HLR). An additional TDP for an incoming call to a prepaid subscriber as a terminating party, which may be called “T-Answer,” also is defined in the prepaid subscriber's subscription information stored in the HLR. If the prepaid mobile subscriber's account balance is above a threshold amount, the call can be processed using the O-Answer and T-Answer TDPs without the need to contact the prepaid platform for authorization, thus reducing the amount of signaling required to process a prepaid call.