I would still think that our Govt. would be using what communications sytems that are still functional to get messages out.
If anything, the "Powers That Be" love to let the public know that any and all situations are "under control" and there is nothing to worry about.
If I remember correctly, The Tower had been monitoring t.v. transmissions. Right? Weren't cell phones working for a while too? The "developed" governments of the world have the ability to send out mass texts to the public via cell phones. I wonder why that hasn't happened. Maybe what authorities are left are too busy trying to survive. I just think that if a place like The Colony can exist then there is no reason that we can't assume that some of our government is left. Somewhere.