Check audio settings and restart device.
There’s also a chance the problem isn’t with the jack or the headphones you’re using but has to do with the audio settings of the device.
Just open up the audio settings on your device and check the volume level as well as any others settings that might mute the sound.
How do you fix sound in earbuds?
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Simple Fix to HeadPhones Working on One Side or Only Works
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How do you fix headphones that won’t play sound?
Plug the headphones into an audio input, then bend the cable while you listen. If you can hear some audio through your headphones, move on to fixing the cable below. Try pushing the plug. If you can only hear audio when you push or manipulate the plug end of the headphones, skip down to fixing a broken plug below.
Why is there no sound coming from my Apple earbuds?
If you can’t hear any sound or if only one side of your headphones works. Adjust the volume with the volume buttons on your iOS device or use the Volume slider in Control Center. To see if you need a replacement, try a second pair of headphones.