Travel cards have little to do with traffic. It is fed back at the base station through our mobile phone signal, and then fed back to our mobile phone with the signal sent by the base station. Traffic only determines that it has little to do with our network and query. As long as our cell phone signal is available, we can collect our itinerary.
Details:
Communication Big Data Travel Card is a free inquiry service for 654.38+06 billion mobile phone users nationwide, which is obtained by China Xintong Institute, China Telecom, China Mobile and China Unicom by using the "signaling data" of mobile phones. Mobile phone users can query all the city information they have visited in the previous 654.38+04 days through this service.
As of March 25, 2020, the cumulative number of inquiries has exceeded 450 million. From 20: 30 on 202118, the city name of the medium-high risk area is no longer marked in red on the travel card, but is marked in brackets after the city name. Precautions are only used as travel tips and have nothing to do with health status.
On March 30th, 20021year, the national government service platform "Epidemic Prevention Health Code" has integrated the relevant information of "Traffic Big Data Travel Card", which can show whether the user has been to medium and high-risk areas and other travel information in the health code, and help the health code "one code pass".