The function of health code is not to prove that you are healthy, otherwise users are not allowed to declare their physical condition and then report it. In fact, it is similar to a QR code of electronic identity. In addition to reporting personal health status, the main function is to master the action track, such as entering the supermarket, taking the bus, subway, plane and train. , and will ask to scan the health green code.
The health pass code is directly related to the risk level of the area where the code holder is located. For example, once the risk level of an area is adjusted from low risk to medium risk, the green health pass code of people in the area will automatically turn yellow.
For those who hold the yellow code, it is necessary to strictly implement the medical observation of home isolation. Fever (body temperature greater than or equal to 37.3℃), fatigue, cough, diarrhea, conjunctivitis and other discomfort.
User identity module (subscriber? Identity? Module (SIM), commonly known as "SIM card", is a smart card, which is mainly used to store user identity data, short message data and telephone numbers.
SIM card is the key for GSM mobile phone to connect to GSM network. Once the SIM card is removed from the mobile phone, the mobile phone will not be able to enjoy all kinds of services provided by network operators except emergency calls. SIM card can not only be used as a key, but also provide a lot of convenience for users. Users only need to insert or embed the SIM card into any GSM terminal to realize communication.
SIM card also manages a lot of information provided to users, which can be used to store short messages, especially those received when users are away or absent.