The 19-digit Lingnantong Transportation Union Card number can be recharged using NFC. NFC near field communication technology evolved from the integration of contactless radio frequency identification (RFID) and interconnection technology. It combines the functions of inductive card readers, inductive cards and point-to-point on a single chip, and can be compatible with Device identification and 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, and more.