Card code double test refers to the "communication big data travel card" and "health code" two tests, referred to as card code double test.

Communication big data itinerary card by the China Institute of Information and Communication Technology in conjunction with China Telecom, China Mobile, China Unicom three basic telecommunications enterprises to use cell phone "signaling data".

Through the user's cell phone is located in the base station location to obtain, for the country's 1.6 billion cell phone users free query service, cell phone users can through the service, query my first 14 days to all the cities and municipalities information.

Health Code is based on actual real data, by the public or return to work back to work through their own online declaration, after the background audit, you can generate belongs to the personal two-dimensional code.

The QR code serves as an electronic credential for individuals to pass in and out of the local area, realizing one-time declaration and universal use across the city. The launch of the health code aims to make the resumption of work and production more accurate, scientific and orderly .

Communication big data itinerary card main function and process:

Communication itinerary card query service is mainly for China's cell phone users, capable of querying individual domestic and international trips within the previous 14 days, accurate to the province and city (stay more than 4 hours) at home, and accurate to the country abroad.

The query is initiated by the user, who can access the query page by scanning the code with cell phone software (WeChat, Alipay, etc.), or enter the WeChat app by searching for "Communication Itinerary Card" and enter the app by entering the cell phone number and clicking on the verification code, and then clicking on the query after the verification is successfully completed, which will return the result of the query.

After the verification is correct, the system will synchronize the declaration information in the "vaccination health information code", which can be viewed by the user in the details page of his vaccination health information. If the verification fails, you need to re-declare.

After accessing the service, users only need to declare their itinerary in the "immunization health information code" to check and prove their place of visit in the last 14 days, without the need to check and prove separately.