1. If using a single earbud, ensure the other is in the case with the lid closed.

2. Try different ear tips and wings for a better fit. Check the L/R marks to ensure they are worn correctly for a tight seal. A poor fit can negatively affect call quality.

3. Ensure your device has "soundcore Liberty 5 Pro" selected as the audio output.

4. Switch to your phone's microphone and then back to the earbuds to see if it helps.

5. If using a third-party app (like WhatsApp or Skype), try making a standard phone call via the default app to see if the issue persists.

6. Test the earbuds in a quiet environment.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.