If you haven't been to Changchun, Jilin, it won't turn yellow. Answering the phone is just a wireless call, no problem.
The health code turns yellow for the following reasons:
1. The confirmed cases in COVID-19 were found in the local area, which was divided into control areas, and the health codes of the people in the control areas were given yellow codes.
2. The health code of those suspected to be consistent with the confirmed cases in COVID-19 is updated to yellow code. For example, the health codes of sub-secret contacts and time-space contacts will be assigned yellow codes.
3. I went to the middle and high risk areas of the epidemic, such as the regional investigators of the epidemic, and the health codes of the personnel in the middle risk areas in the past 14 days were given yellow codes.
4. A comprehensive nucleic acid test is needed, but without nucleic acid test, the health code will be given a yellow code.
5. The person whose personal mobile phone number and identity information match the yellow code.
Changchun is an important commodity grain base in China, with the total grain output and per capita possession ranking first among big cities in China for a long time, among which yushu city has been ranked first for many years and is known as the first granary in the world.