1. A method comprising: monitoring traffic associated with an end-user device communicatively coupled to a network system over one or more wireless access networks, the end-user device including at least one modem, a user interface, and at least one software component enabling the end-user device to access at least one data service over the one or more wireless access networks, the traffic comprising one or more data transfers; identifying, in the traffic, particular data transfers within a service activity category, the service activity category identifying a set of one or more service activities less than all service activities associated with the end-user device, the service activity category identifying a particular end-user device application or a particular network communication end point; determining a service usage measure based on the identification of the particular data transfers within the service activity category; based at least in part on the service usage measure, generating a notification configured to assist in causing the user interface of the end-user device to present service usage information; and obtaining a user input from a user of the end-user device, the user input associated with (1) the presented service usage information, or (2) a control policy applicable to one or more attempted or successful communications within the service activity category.