The secondary card of the mobile phone will display the travel code.

It can be seen that there are many methods, which are listed as follows:

1. Let the mobile phone automatically connect to the network. For SMS inquiry, send a short message CXMYD to its operator (Telecom10001Mobile 10086/ Unicom 100 10) for inquiry;

2. Unicom users can send CXMYD, and the mobile phone number corresponds to the last four digits of the ID number to 100 10, so they can query the roaming information of 14 days.

3. If your travel code can't be displayed, it may be because the network signal is not good or the mobile phone is broken, which will lead to the failure of the travel card system. You can refresh the network or restart the phone.

Extended data:

Health QR code

Travel code is the code of communication big data travel card, which is also equivalent to health code. China Institute of Information and Communication, together with China Telecom, China Mobile and China Unicom, used mobile phones to receive data, which was obtained through the location of the base station where the users' mobile phones were located, providing free inquiry service for the 654.38+06 billion mobile phone users nationwide. Mobile phone users can query all the city information they have been to before 654.38+04 days through this service.