What is a "no-code" person with a health code?

It refers to the old people who use old machines and the children who don't have mobile phones. Health Code is a personal health information and activity information judgment system for preventing and controlling COVID-19 epidemic. Individuals can declare online by themselves, and after background review, they can generate their own QR code, which can be used as individuals to enter and leave a certain area of electronic certificate. Old people who use old machines and children who don't have mobile phones can't complete the declaration, which is the so-called code-free personnel.