When changing your mobile phone number, there is no need to cancel your credit card. You only need to contact customer service and provide ID verification to update the reserved information. The following are some notes on credit card cancellation:

1. When canceling an account, individual users need to bring valid identity documents, and entrusting others to handle the process requires the original identity cards of both parties; organizational users need to submit their company ID and personal ID. . Users from other places cannot handle it directly and need to find someone to handle it on their behalf. However, they must ensure that both the principal and the principal bring their ID cards.

2. Users within the agreement period and those with overdue fees cannot cancel their accounts immediately and must first settle all relevant fees. Before canceling the account, you must ensure that the account balance is zero.

3. The credit card cancellation process is relatively complicated and is divided into two stages: pre-account cancellation and formal account cancellation. Pre-cancelling the account is to avoid overdraft bill problems. Even if the account is locked, the bank may still wait for the merchant to request payment within the 45-day liquidation period. Only after confirming that there is no outstanding balance can the account be officially closed.

4. Note that within six months after the credit card is canceled, the cardholder can apply for reinstatement, but defaulting on the credit card does not mean canceling the card to avoid liability. It should be clear that canceling a credit card is not a simple cancellation, but a formal process that requires confirmation that there is no outstanding balance.

The above information comes from Baidu Encyclopedia, Baidu Encyclopedia and Xinhuanet to help you understand the detailed steps and precautions for canceling credit cards.