First, there is no communication travel code because the mobile phone traffic is not turned on and the mobile phone traffic function is turned off. Second, because too many people visited, the system crashed and patience was needed.
In addition, if you can't use Alipay to query travel itinerary code, you can send SMS to query. Due to the upgrade and maintenance of the health code system, the full name is not displayed, and some user information is not updated, resulting in abnormal health code information.
special technology
The communication big data travel card analyzes "mobile phone signaling data" and obtains it through the location of the base station where the user's mobile phone is located. The collection, transmission and processing of signaling data are automatic, with strict security and privacy protection mechanisms, and the query results are available in real time, which is convenient and fast. The data of "Traffic Big Data Travel Card" can be used nationwide.
To truly achieve comprehensive national coverage, you can also check the international itinerary of my domestic mobile phone number. On the premise of ensuring user information security, these will provide scientific and accurate technical support for epidemic prevention and control, resumption of work and production, road traffic, entry and exit, etc.
The data source of the location query service provided by the travel card is "mobile phone signaling data", which is obtained through the location of the base station where the user's mobile phone is located. In order to ensure continuous communication, realize no blind area coverage and provide better communication service quality.
The base station signals of the two places at the junction of administrative divisions may overlap, leading to the deviation of the results. This may happen if the user lives near the city boundary or travels long distances by car or train.