A system and method are described that enable policy-implementing modules in a mobile wireless network to identify the location of a user and render policy-based (e.g., quality of service, accounting, throttling, etc.) decisions based upon a variety of additional information such as: home network availability in a market, user class, time of day, network congestion, application type, etc. The system renders policy decisions, based upon geo-spatial location information, by receiving a mobile wireless data message including a geospatial identifier. Thereafter, a policy engine renders a data service policy decision by applying a policy to the geospatial identifier. The potential classifications identified by the data service policy decision include an in-market roaming mode wherein a data usage is treated as non-roaming, even though associated with a roaming data session, based upon an in-market location specified by the geospatial location information.