1. A method for operating a service design system to implement a service plan including one or more wireless network data services to be provided by one or more wireless access networks to one or more wireless end-user devices, the method comprising: accepting, via a service design system user interface, user input defining an event associated with a use of at least one of the wireless access networks according to the service plan; receiving, via the service design system user interface, user input specifying a plurality of service policies associated with the defined event, the service policies including at least two of an access policy that defines rights to access a wireless network data service selected from a plurality of Internet data service definitions available for user selection via the interface, a service accounting policy that defines accounting for using the wireless network data service, and a notification policy that defines when to provide notifications corresponding to the wireless network data service; creating a definition for the service plan based at least in part on the defined event and the at least two specified service policies; and automatically translating the service plan definition into instructions for one or more policy implementation elements, the instructions to cause the one or more policy implementation elements to implement the specified service policies when the event is detected for at least one applicable wireless end-user device's use of at least one of the wireless access networks, the at least one applicable wireless end-user device subject to the service plan.