1, the contract card number of Unicom. Generally, it is impossible to cancel the account during the contract period. After the contract expires, you need to go to Unicom's own business hall with the owner's certificate to cancel the account. 2. If the number within the contract period has not been used, the number will be automatically cancelled after three months of arrears, and the number will generate arrears and liquidated damages. At the same time, the ID card will be blacklisted and will not be able to handle any business after blacklisting; After being blacklisted, China Unicom will recover the arrears by telephone or dunning letter; 3. In this case, you need to go to Unicom's business hall with your owner's ID card to check your name and number and the amount of arrears, and then you can cancel the blacklist after you make up the fees.