These methods are too simplistic to work. What needs to be done is a loose network of techies needs to be formed. They need to develop a plan to hijack microwave and cell phone data towers, transmit data over existing infrastructure (thousands of miles of fiber optics), and develop backup wireless communication. Let’s face it, if the government shuts down the Internet, it’s war!
The only way to shut it down would be to shut down The Grid.
Rural areas would be a problem (at first) and it would probably have to go back to text only but it would still be communication.