Once the Unicom number is blacklisted, it will have a series of adverse effects on users. First of all, the blacklisted Unicom number will not be used normally, and users will not be able to make calls, send text messages, use traffic, etc. This will seriously affect the user's communication experience, and may even cause the user to be unable to communicate with others normally.

Secondly, blacklist records will have a negative impact on users' credit records. Unicom will submit the blacklist records to relevant credit reporting agencies, which will have an impact on users' personal credit scores. If users want to apply for loans, credit cards or other financial services, the blacklist records may be referenced by financial institutions, resulting in rejection of applications or higher interest rates.

Furthermore, blacklist records will also affect users' business handling in other operators. If users want to transfer to other operators, they can query the blacklist records. Once found, other operators may reject the user's application for network transfer, or require the user to clear the blacklist record first.

Finally, blacklist records may also cause users to face legal responsibilities. If users are blacklisted due to malicious arrears and fraud, Unicom may recover arrears or bring a lawsuit through legal channels, which will bring unnecessary troubles and losses to users.

To sum up, the blacklist of Unicom numbers will cause many adverse effects on users, including communication restrictions, credit damage, blocked network transfer and possible legal responsibilities. Therefore, users should avoid violating regulations and use Unicom services legally and in compliance to avoid being blacklisted.