1. An end-user device comprising: a modem for enabling the end-user device to access one or more network communication end points over a wireless network; memory configured to store at least a portion of a service policy associated with one or more service activities, the one or more service activities being fewer than all service activities available to the end-user device, the service policy for providing, to a sponsor entity, an accounting of at least a portion of a wireless network usage cost or usage measure associated with the one or more service activities over the wireless network, the sponsor entity being an entity other than a user of the end-user device, other than an account-holder associated with the end-user device, and other than an operator of the wireless network; and one or more processors configured to: monitor end-user device data traffic, identify, in the monitored end-user device data traffic, an intended, attempted, or successful data communication over the wireless network associated with the one or more service activities, and in response to identifying the intended, attempted, or successful data communication over the wireless network associated with the one or more service activities, apply the at least a portion of the service policy.