When everything else hits the fan, SMS still ends up somewhat working. Might not be enough bandwidth for a call or application - but in an emergency, the best

When everything else hits the fan, SMS still ends up somewhat working. Might not be enough bandwidth for a call or application - but in an emergency, the best chance for getting a message out on a crappy network is still texting. Might take a bit of tries, but it will be the first to work.