1. First of all, the use of the Android large-screen navigation toolbox requires the establishment of a pairing relationship between the mobile phone and the car Bluetooth navigation device.

2. Secondly, the use of Android large-screen navigation toolbox needs to search for Bluetooth devices in the mobile phone, and then select the pairing connection after finding it.

3. Finally, use the Android big-screen navigation toolbox to connect the car Bluetooth with the mobile phone Bluetooth, and then you can make and receive calls after success.