I sent a text message saying it would turn yellow, but it didn't change.

If it hasn't changed, don't worry. There are also many SMS scams now, so pay attention.

There are two ways to apply for changing health code to green code: 1. Yellow code personnel will automatically turn to "green code" after completing centralized isolation medical observation and management at home.

2. The yellow code personnel should go to the nearest medical institution or third-party testing institution for nucleic acid testing in time. After the test results are negative, some areas will automatically adjust to the green code, and some areas need to apply to their units or communities according to local policies and epidemic prevention needs, and provide negative results of nucleic acid test within 48 hours. After the unit or community audit, report to the district and city epidemic prevention and control headquarters for transcoding.