How to query the amount of arrears for the account with arrears of Unicom number?

As you said, if it is a Unicom number, you need to take the owner's ID card to the Unicom business hall to check the number and the amount of arrears under the ID card.

After Unicom paid the number, the number was cancelled after the arrears stopped for three months, resulting in arrears and liquidated damages, and the ID card was blacklisted;

If the post-paid number has been cancelled due to arrears, you need to hold your ID card to check the amount of arrears in the business hall, and you can cancel the blacklist after clearing the fee;

After the cancellation of the post-paid number, there will be arrears and late fees.