The signaling interface between a wireless network message center and a prepaid control platform is enhanced by the addition of one or more parameters useful in supporting special accounting treatments for user message communications through a wireless network, for example, include a ConnectedAddressList, an ExceptionIndicator and/or a PolicyOverrideIndicator. The ConnectedAddressList and PolicyOverrideIndicator can be used to allow a prepaid wireless service provider to offer a wide variety of free or specially priced messaging buckets to its subscribers (or to a select group of its subscribers). User messages may be delivered for free, for example, if they are going to or coming from other customers of the service provider. The ExceptionIndicator can be used to block application of such buckets, e.g. to enable premium pricing, for international delivery or the like.