Why the internet??
Pilots have had to file certain flight plans before the internet became a tool for filing ,so if you do not have internet access you should know where and how to file a plan.
If you do not have the internet do you think you should know where and how to file one.
The phone has been around a long time, may be find the phone number of the parent Air Traffic Services Unit and file one with them???.
At the end of the day a flight plan if handled correctly is for the pilots own health and not for the air traffic unit so do things in the correct way please.
