1. A wireless end-user device, comprising: a wireless wide area network (WWAN) modem to communicate data for Internet service activities between the device and at least one WWAN, when configured for and connected to the at least one WWAN; and one or more processors configured to, for a time when data communication for Internet service activities is provided by the WWAN modem and the at least one WWAN, classify whether a first end-user application associated with an Internet access request, and capable of both i) interacting with a user in a user interface foreground of the device, and ii) at least some Internet service activities when not interacting with a user in the device user interface foreground, is interacting with the user in the device user interface foreground, and allow or disallow the Internet access request based on the classification as to whether the first end-user application is interacting with the user in the device user interface foreground, and based on a power state control policy for the modem, such that for a case that the first end-user application is classified as not interacting with the user in the device user interface foreground, the power state control policy is enforced to allow, disallow, or delay the Internet access request to follow a temporal policy profile for changes in modem power state.