Hi, I'm Randy. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Nothing... Would the headphone icon be on if it was stuck?
Does the icon go off and on when you connect and disconnect the headphones?
Okay, does the volume level indicator go up and down with the headphones disconnected?
Yes it does
Try Adjusting volume controls and see if you're getting notifications/ringing/vibrating as when receiving texts/email.
The volume can also be adjusted by pressing the volume button (located on the right side) up or down.
You can also try this app and see if it helps.
Okay, unfortunately that sounds like the speaker control on the main board has failed.
Ok, i was hoping there was something else i could do. But thank u for ur time!
Your welcome !