Connecting a Bluetooth headset is a convenient option when listening to music or radio on your phone. The following are some steps and suggestions to help you use your mobile phone to listen when connected to a Bluetooth headset:

1. Turn on the Bluetooth function of your mobile phone: Enter the settings interface of your mobile phone, find the Bluetooth option, and make sure it is turned on.

2. Turn on the Bluetooth headset: Press the power button on the Bluetooth headset to turn on its Bluetooth function.

3. Set the Bluetooth headset to pairing mode: Different brands of Bluetooth headsets may have different pairing methods. Please refer to the headset manual to learn how to set it to pairing mode.

4. Search and pair Bluetooth headsets on your phone: Return to the Bluetooth settings interface of your phone, click "Search for Devices" or similar options, and wait for the phone to search for a list of available Bluetooth devices. Find your Bluetooth headset and tap it, then follow the on-screen prompts on your phone to complete the pairing process.

5. Set the audio output to a Bluetooth headset: Once the Bluetooth headset is successfully paired, you can set the audio output to a Bluetooth headset in the audio settings of your phone. This way, when you listen to music or the radio, the sound will be played through the Bluetooth headset.

Some suggestions:

- When purchasing Bluetooth headsets, consider choosing products with good sound quality and stable connections.

- Make sure the Bluetooth headset has sufficient power to avoid power interruption during use.

- If you are experiencing connection issues, you can try restarting your phone and Bluetooth headset and making sure they are both on the latest firmware version.

- If you frequently use a Bluetooth headset, you can set it as your phone's default audio output device so that it automatically switches to the Bluetooth headset every time you connect.

I hope the above information is helpful to you!