A method comprising storing information about a service plan, the service plan having a limit on usage of at least one of one or more network services, the service plan being associated with an end user device; detecting a device action that reflects or is associated with a past, current, or intended use by the end user device of the at least one of the one or more network services; identifying the device action as a trigger event; identifying notification request information based on the trigger event, the notification request information for use by the end user device in presenting, through a user interface of the end user device, a notification message comprising notification information, the notification information based on the notification request information; and transmitting the notification request information to the end user device in response to the trigger event.