Legal analysis: during criminal detention, there is no personal freedom and credit cards cannot be used. If you are criminally detained and don't pay back your credit card, you will be sued by the bank for repayment.

Legal basis: Article 66 of the Criminal Procedure Law of People's Republic of China (PRC) stipulates that the people's courts, people's procuratorates and public security organs may summon criminal suspects and defendants, obtain bail pending trial or monitor their residence according to the circumstances of the case.