Why can't Unicom receive the verification code?

Anti-harassment settings. Unicom has a high safety factor. In order to ensure the privacy and safety of customers, mobile phones have harassment function. When you encounter a verification code or a short message, it may lead to misjudgment, resulting in the inability to receive messages. You can check it in the phone's call settings, usually in the SMS anti-harassment or blacklist, where you can find the verification code.