A method performed by a network system operated by or on behalf of a service provider, the network system capable of communicating with a user device over a wireless access network, the method comprising establishing, in cooperation with software running on the user device, a secure link between the network system and the software, the secure link for preventing unauthorized access to communications between the software and the network system; providing, to the software over the secure link, first information enabling the software to assist a user of the user device to view, select, or change an aspect of a service plan associated with the user device; and providing, to the software over the secure link, second information, the second information enabling the software to present, through a user interface of the user device, a notification about a past or current service usage by the user device.