The reason why Dolphin NFC is not sensitive is because the phone case it comes with is too thick. The thickness of the mobile phone case will affect the recognition, and it has a certain relationship with the hardware of the mobile phone. You can just re-identify the NFC. NFC evolved from the integration of contactless radio frequency identification (RFID) and interconnection technology. It combines the functions of a proximity card reader, a proximity card and point-to-point on a single chip, and can identify and communicate with compatible devices within a short distance. Data exchange. Mobile phone users can travel across the country with their mobile phones equipped with payment functions: their mobile phones can be used as airport check-in verification, building access keys, transportation cards, credit cards, payment cards, etc.