When you use the U-Shield in ICBC's mobile banking, you encounter the error of "U-Shield Signature Failed or Incomplete (31)". Here are some suggestions for you to solve: First, try to use the same U-Shield on the computer version of online banking. If the online banking is running normally, the problem may be the U-Shield itself, so I suggest you go to the counter to replace it. If the online banking is correct, try to uninstall and reinstall the mobile banking client. When selecting "audio port", make sure to select "Allow", and pay attention to whether the U shield lights up during the signature process. If it doesn't, it may be caused by insufficient power of the U shield. For users who use LeTV mobile phones, it is especially necessary to pay attention to adjusting the mobile phone settings. In "Settings"->; "Privacy Authorization" -> "Application List/Privacy Authorization"->; In "Industrial and Commercial Bank of China", change the permission of "Recording" to "Allow" and close "Settings" at the same time -> "Sound and vibration"->; "HiFi" function.

China Industrial and Commercial Bank, as one of the top five banks in China and one of the top 5 enterprises in the world, was established in 1984. It is committed to providing financial support for enterprise production and technological innovation and serving the economic construction of China through its huge customer base and strong credit management.

as the largest wholly state-owned commercial bank in China, the core task of ICBC is to raise funds through global financing activities in accordance with national laws and regulations, strengthen credit management and support national economic development.