The reasons and solutions are as follows
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The Bluetooth headset is not in pairing mode.
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Solution: There will be a functional button on the Bluetooth headset, this multi-functional button has a role is to match between the device and the Bluetooth headset, when connecting with the mobile phone, you need to long press this function key, at the same time, you need to open the Bluetooth function of the mobile phone to search, see the corresponding headset name after clicking, and confirm the pairing can be connected.
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The Bluetooth headset has been connected to other mobile phones and has saved the pairing record, so it cannot be connected;
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Solution: This situation requires forgetting the previous saved Settings and re-pairing can be done. Due to the different Settings of different Bluetooth headsets, you need to refer to the relevant product instructions for specific operations.
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Mobile phone Bluetooth is not compatible with the Bluetooth version of the headset.
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This is a hardware problem, consumers themselves can not solve, it is recommended to find a headset seller for return and exchange. Before making a purchase, it is best to refer to the product description to see the Bluetooth technology supported by the phone and Bluetooth headset, or a list of compatible. There are other cases, or the Bluetooth function of the mobile phone or headset is damaged, and it is not able to transmit and receive Bluetooth signals normally, at this time, it is necessary to repair.
1. First of all, confirm that the Bluetooth function of the mobile phone is turned on; Click the power button to turn on the Bluetooth headset. Note: it is not possible to pair the Bluetooth headset.
2, continue to press and hold Bluetooth headset, progress pairing connection function; Go back to the phone, search for the Bluetooth device that needs to be connected in the phone Bluetooth list;
3, click the search Bluetooth device, Bluetooth pairing connection;
4, when the headset shape is displayed above the phone, or the Bluetooth device prompts that it is connected, it means that the Bluetooth device is successfully connected.