Why does the mobile phone only display the health code and not the travel card?

The travel card is offline. By the end of June 2022, 5438+February 65438+March, the travel card was completely offline, and the travel card announcement was communicated according to the official account of WeChat. Communication big data travel card, commonly known as travel code, is the signaling data of mobile phones of China Information and Communication Research Institute, China Telecom, China Mobile and China Unicom.