Solution:
The general process is: bluetooth pairing >> contact download >> make call.
① Mobile phone search car Bluetooth, after searching, click to connect.
② The contact is downloaded from the mobile phone to the vehicle-mounted Bluetooth system. There is a prompt "Application for phone contact rights" on the mobile phone. Click "Yes" to see the contact displayed on the vehicle-mounted Bluetooth system.
③ Click the contact to make call.
Some models will have pairing keys when bluetooth pairs with mobile phones, such as 1234, 0000, 8888, etc.
Note: Different car bluetooth systems will be different.