1. A method performed by a network system, the network system capable of communicating with a wireless end-user device over a wireless access network, the method comprising: communicating with the wireless end-user device via a secure communication link across the wireless access network between the network system and software executing on the wireless end-user device, the secure communication link preventing unauthorized access to communications between the software and the network system; providing over the secure communication link to the wireless end-user device, first information, the first information enabling the software to assist a user of the wireless end-user device to view, select, or change at least a data service usage aspect of a service plan associated with the wireless end-user device; and providing over the secure communication link to the wireless end-user device, second information, the second information enabling the software to present, through a user interface of the wireless end-user device, a notification about a past or current data service usage by the wireless end-user device.