An 
improved method and 
system for accessing 
wireless data services that reduce messaging and enable 
roaming subscribers to access data services are described. A 
wireless communication 
system in accordance with the present invention includes at least a 
service control point and a 
gateway system (e.g., a Gateway Generalized 
Packet Radio Service Serving Node (GGSN)) that is coupled to a data network. To obtain access to data services, a 
wireless subscriber unit establishes communication with a 
gateway system and requests data services from the 
gateway system. In response to the request, the gateway 
system queries the 
service control point regarding authorized data services for the subscriber unit. If the gateway system receives a negative reply from the 
service control point, then the gateway system denies access to the data services by the subscriber Unit. However, if the gateway system receives a positive reply from the 
service control point, then the gateway system enables access to the data services by the subscriber unit. In a preferred embodiment, the gateway system tracks the requested data services utilizing pre-defined resource units. In one embodiment, the gateway system tracks 
service utilization by periodically querying and receiving a reply from the 
service control point after each pre-defined resource unit has been utilized. In this embodiment, the 
service control point updates an account balance of remaining resource units in response to receiving the queries and informs the gateway system when 
data access should be denied.