Tuniu Travel Network suddenly sent me a verification code.

The mobile phone number was leaked. Mobile phones don't receive verification code messages from websites for no reason. Tuniu Travel Network suddenly sent me a verification code, which was leaked and used by criminals. They bombard mobile phone numbers with spam messages such as verification codes in a short time. You can try to use third-party mobile phone housekeeper and other software to set up harassment interception to reduce harassing text messages.