How can I fix a malfunctioning headphone jack on my mobile device?

1. Check if the headphone jack itself is clean and free of debris.
2. Try different headphones to check whether the issue is with the device or the headphones.
3. Reset the device by pressing and holding the power button for 10-15 seconds.
4. Check the device's audio settings.
5. Back up device data and contact customer care for further assistance.
6. Reconnect headphones after restarting the device.