It is very convenient to cancel, just call the credit card customer service hotline and transfer to manual service, no matter whether the card is opened or not, as long as there is no debt in the current account. After the processing is successful, cut the card and destroy it yourself. If the account has not changed within 45 days, the cancellation is successful.
There is no annual fee if you don't open a credit card. If your credit card has not been opened, you don't need to cancel it. You never know when it will be useful. You can use it right away if you want. If it is really useless, the card will automatically expire after the expiration of the validity period, which is equivalent to cancellation.