Since the iPhone 7, the iPhone has removed the headphone jack, leaving only the Lightning interface, while the ICBC mobile phone U-Shield uses the 3.5mm headphone jack, finds out the adapter that comes with the phone, and after many attempts, it still cannot be used normally. After frequent attempts to configure, it is finally available
Operation method
Open Phone Settings ->General ->Auxiliary Functions ->Mono Audio, and set "Mono Audio" to off; Telephone noise cancellation is set to ON
Settings ->Privacy ->Microphone, set the ICBC U-Shield and ICBC App to enabled status
Connect the mobile phone adapter to the ICBC U-Shield, and then connect it to the Lightning interface of the mobile phone
Open the ICBC App to check whether the U-Shield information can be read normally, and make sure that the U-Shield battery is still charged. The U-Shield that has not been used for a long time may not work. You need to charge the U-Shield before using it