I once worked with a Chef that couldn't read. He made it through culinary school, had his own catering company at one point and owned two residential properties. He was a charismatic guy but very cunning and deceptive. I figured it out after a couple of weeks working with him. I tried to offer him help but he just brushed it off and said that he was dyslexic. Smart phones have many features that make it easy for illiterate people to survive.