A system communicatively coupled to a device over a wireless access network, the system comprising one or more processors configured to establish, in cooperation with one or more agents on the device, a secure control link enabling secure communications between the system and the one or more agents over the wireless access network, and a service interface enabling the one or more processors to communicate over the secure control link with the one or more agents to assist the one or more agents to change at least an aspect of a service plan associated with the device, and provide, to the one or more agents, information about a past or current service usage by the device to enable the one or more agents to present, through a user interface of the device, a notification associated with the past or current service usage by the device.