About the notification icon on the status bar, there must be another way to keep the notification without the icon. I hate icons there that do not provide any useful information, taking out valuable space. But keeping the info on the notification area is a great way to have it where you can easily access it without having to open the app each time.
I have found the following reference about one possible method: stackoverflow.com/questions/2855110/android-no-icon-for-notification
I don't know if this is how 3G watchdog does it, there could be other ways. But one way is enough, if it works...
Another separate suggestion would be to increase (or even better, make configurable) the time that the toast messages, if selected, are presented on the screen. The default is a little too short to assimilate the information.