Consult my mobile phone number? Why did the health code change back to the mobile phone number of another city?

Other cities are set up on the health page.

It may be that the health page has set up other cities, it may be a system failure, or it may be that your ID card has handled a mobile phone card for others, and the WeChat health code has a corresponding city. Health code is a provincial small program, which will not change automatically. If the user changes his/her location and needs to reapply for the local health code, he/she can reapply according to the local registration process.