My iPhone 4 headphone jack isn't working?

Ok so this started today and I tried to plug in headphones and the speakers on the iPhone kept running and I looked in the small headphone jack hole and I could see it lighting up when I turned my pone on and off? Is there a way I can fix this? And I'm getting a pone upgrade soon but will apple take it with a broken headphone jack?

You've probably have something stuck down there because i had the same problem got a safety pin stuck it down there and it was a piece of cotton from my pocket after i tried to see if my headjack would work and it did

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