Start by using a flashlight to check inside of the Jack to make sure that there's no debris in there.Then take AQ tip with rubbing alcohol.Clean carefully down inside of the jack. If that doesn't work then you're gonna have to take Your phone apart somehow and take out the logic board and reflow the solder joints of the jack itself. But I stress that you double check your settings to make sure that it is allowing you to utilize a headphone set up With the Jack. Also, make sure your volume dial on the headphones is up and try utilizing a different pair of headphones. If you don't have a different pair of wired headphones, then you can go to a Dollar Tree 5 below or really Any dollar store and pick up a really cheap pair of headphones that can always be returned and try those out. And i hope this helps you. Please let me know if you get it figured out. Have a good day