Maybe your device is temporary frozen and is unable to detect the headphones or reroute the sound to them. Try restarting the device or turning it off and back on, after a few seconds.
If the issue still persists, check out the other solutions.
Maybe the headphones port does work, but the volume level is very low. Try turning up the volume and test if you can hear anything through the headphones.
If the volume is already turned up, but the speakers doesn't produce sound, check out the other solutions.
Sometimes, this is the only thing you need to do in order to make the device recognize the headphones.
Maybe the headphones are recognized, but the device's volume is muted. All you have to do is to unmute it.
Maybe the headphones port of your device is clogged with dust. In order to clean it, you will need a cotton bud (cotton swab) and rubbing (isopropyl) alcohol. Put a small quantity of isopropyl alcohol on the bud and gently insert it in the headphones port. If the swab gets dirty (once you take it out), repeat this process until the cotton bud is fully clean.
Wait a few minutes before plugging in headphones, so that the alcohol inside the headphones port evaporates.
The port in which the headphones should be plugged in is usually colored green. If the headphones are plugged in a different port, your device won't recognize them.
Note: If there isn't a green port, look for a headphones icon on your device and plug the headphones in that port.
Your device won't recognize the headphones if they aren't properly connected. Make sure to push them to the end of the headphones port, but in a gentle way.
Note: If you use a protective case, remove it temporarily, because it might be the one preventing your headphones from being attached to the device firmly.
Maybe the headphone issue you experience is part of the latest operating system update. In order to resolve the issue, you need to apply the update. You should be notified once an update for your device is available, however, this is not always the case.
See the don't know how to update my device's operating system guide to learn how to check for updates, manually.
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