I had already commented this 7 months ago when Russia did the same thing. "In the interest of the people everywhere in the world, there should always be dial-up access points available, in different countries. The "national interest", for whichever country, should always be the people's interest; and restricted information has never been of any benefit except for those restricting it" Someone had raised the point tha…
I think radio based communication like amateur broadcasting, walkie talkie like things for short distances can be an effective tool to prepare for situations like this.