You can cancel the blacklist by paying off the arrears. If in doubt, you can also consult the local 100 10 manual customer service or bring your ID card to the business hall for details.
If you don't pay the arrears, it will lead to late fees, which will affect your future Unicom business after being blacklisted.
Tips: Take Jiangsu Province as an example. There may be differences in policies among provinces and cities, and the attribution policy shall prevail.