Millions would die within a month as food, medicines and health care distribution would come to a halt. Anyone with the need of daily medication would be in big trouble almost over night.
Anyone in the hospital and not ambulatory would die very quickly as back up generators would be fried right along with the regular infrastructure. Same with nursing homes.
It would be a catastrophe of epic proportions.
“Tens of millions could starve.”
That’s really a sad statement,,to think millions of people don’t know how to grow a vegetable garden (there’s even winter time vegetables that can be grown.) Or go catch fish in a stream. Or last option (I love animals) shoot a rabbit, deer, or squirrel.
Maybe millions would quickly learn how to fish. Walk out of those cities and find a good pond or fruit tree, maybe some wild muscadines. Since no one would be able to text, there would be plenty of free time to hunt for food.