Use a flashlight to look into the jack for signs of dirt and debris, carefully use IPA 90% on a Q-Tip and twist it in and out of the jack, check your phone settings and make sure wired headphone connection is allowed and on. Or lastly carefully take your phone apart(look up a teardown video) take out the logic board and reflow the solder joints of the jack. And lastly if all that don't work then back up your entire phone except the settings and then factory reset the phone(this should be done every other month anyway). That's my advice to all out there hope it helps!!!