The mobile phone number reserved by the bank and the bound bank card are two concepts. The mobile phone number reserved by the bank is just a way for the bank to contact you, not a bank card. You must personally go to the bank's business window to bind the bank card, that is, bind your bank card and your mobile phone number, including WeChat Pay Alipay, so that your Xiaomi wallet can be used normally. It is important to say again that you must go to the bank's business window in person to bind the bank card, which is the real binding bank card.