By default, mobile phones with Bluetooth headsets are not Bluetooth. When the phone with Bluetooth headset is not Bluetooth by default, we can reset it. We can set Bluetooth as the default mobile phone.

First, click "Settings" on the phone desktop. After entering the setting interface, select the "General" option. Then find the "Accessibility" item and click Enter. After entering, open the "Audio Call Mode" item to enter.

Open the settings icon on the phone's desktop. After entering the settings, click Enter Bluetooth to turn on the Bluetooth function and turn on the Bluetooth headset. After the Bluetooth headset is turned on, press and hold it for 5 seconds, and there will be a voice prompt, whether to release it and wait for pairing.