Why is there a travel card?

The travel code is related to the mobile phone card, and the communication travel card is located by the mobile phone signal.

The itinerary inquiry service jointly launched by China Information and Communication Research Institute, China Telecom, China Mobile and China Unicom was launched to the public on February 13, and users can inquire their places of visit within 14 days for free. The data source of location query service provided by 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.

Matters needing attention

In order to ensure communication continuity, realize coverage without blind areas and provide better communication service quality, the signals of base stations in the two places at the junction of administrative divisions may cross-cover, resulting in deviation of results. This may happen if the user lives near the city boundary or travels long distances by car or train.