When the nfc function is turned off, a credit card error will be displayed. The nfc reading error of the mobile phone may be caused by the following problems: 1. Is the system time of the mobile phone normal and the system version up to date? 2. Try to replace other gates, or switch back after switching to other cards in the card swiping interface, and then try again. 3. Turn off the phone and turn it on again after it is completely turned off (it is very important that it must not be restarted directly, and restarting has no effect). This process will restart NFC. After booting and unlocking the system, try to swipe the card in the screen state.