If your husband can pay back the credit card before he is arrested, you can inform the bank's collection staff that your husband has been arrested, so there is no way to pay back the money. You can also scan your husband's detention notice or arrest notice and send it to the bank.
If your husband has been unable to repay the credit card, whether you answer the phone or not will have little effect on him, and the bank may also sue your husband for repayment.