Credit cards cannot be bound to other people's mobile phones. Binding a credit card requires real-name authentication, that is, the bound mobile phone number and the identity information of the credit card holder need to be consistent. Therefore, unless the third-party trading platform on someone else's mobile phone uses the information of the credit card holder for real-name authentication, it is impossible to bind the credit card to someone else's mobile phone. This is to protect the security of credit card holders and the confidentiality of personal information. So under normal circumstances, credit cards can only be bound to their own mobile phones.