Network congestion or wrong cell phone number. Two-dimensional code is also called two-dimensional bar code, and the common two-dimensional code is QRCode, which is QuickResponse. It is a very popular coding method in mobile devices in recent years, which can store more information and represent more data types than traditional bar codes. The QR code signature cannot fill in the mobile phone number because of network congestion or wrong filling in the mobile phone number. In coding, the concepts of "0" and "1" bit streams, which constitute the internal logic foundation of the computer, are skillfully used, and several geometric shapes corresponding to binary are used to represent the numerical information of characters, which can be automatically read by image input equipment or photoelectric scanning equipment to realize automatic information processing.