Change your mobile phone number: If your mobile phone number is considered to be a security risk, I suggest you change it to a new one. If you don't change your mobile phone, it will lead to hacking and even personal information disclosure, such as ID number and bank card number.
Consult the operator: If your mobile phone number indicates a security risk when registering Netease mailbox, you can try to contact the operator to solve the problem. In addition, you can also bring your ID card to the mobile business hall to find the cause of the risk and eliminate it.