1, it may be connected to the wrong Bluetooth, because the interface has many, the wrong Bluetooth. The solution is to disconnect and reconnect.
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2, Bluetooth headset speaker no sound
. The solution is to re-pair the phone with Bluetooth, adjust the volume of the phone, and keep the Bluetooth headset within 10 meters of the phone. First of all, after you plug in the headset, check whether the headset icon appears on the top of the phone. If there is no icon, check whether the headset is plugged in properly. If there is an icon, you can try to adjust the volume, turn it to full volume or no sound, or the headset is not compatible, or the headset control is broken.