Why can I make a phone call when my Unicom card is cancelled?

After the successful cancellation of Unicom's mobile phone number, the number does not exist, no function can be used, and it is impossible to make a call. If you can still make a phone call after closing the account, it means that the account closing business has not been successfully handled. It is suggested to call 100 10 manual customer service or go to the local business hall to inquire about the handling of account cancellation business.