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 access network; a user interface; memory configured to store a service policy associated with a particular service activity of a plurality of service activities available to the end-user device, the service policy configured to: assist in charging a sponsor entity for at least a portion of a wireless-access-network usage cost or usage measure associated with the particular service activity over the wireless access network, the sponsor entity being an entity other than a user of the particular end-user device and other than an operator of the wireless access network, and assist in presenting a notification through the user interface; and one or more processors configured to: monitor end-user device data traffic, identify an attempted or successful data communication over the wireless access network associated with the particular service activity in the end-user device data traffic, and in response to identifying the attempted or successful data communication over the wireless access network associated with the particular service activity, apply the service policy.