The BYD card key can be copied through the mobile phone, the specific steps are as follows:
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Download and install BYD's official APP, such as \"BYD Smart Key\" APP.
Open the APP and register an account, then follow the prompts to add vehicle information.
Select \"Add Key\" in the APP, then select \"Card Key\".
Place the original card key on the NFC sensing area on the back of the phone and wait for the APP to read the key information.
After reading successfully, the APP will prompt you to enter the name of the new key and ask you to confirm whether you want to copy the key.
Once confirmed, the APP generates a new virtual key and saves it in the phone.
The new virtual key is paired with the vehicle and can then be turned on and off using your phone.
It should be noted that not all BYD models support the copying function of the card key, and the specific situation needs to be determined according to the model and vehicle configuration. In addition, when using the virtual key, you also need to pay attention to protect the security of the mobile phone and APP to avoid being stolen by others.