Why can't I hear anything from my iPhone 4s?

I can't hear anything except when on the phone; without headphones in.
The volume doesn't show up unless I have headphones in.
And I've tried putting the headphones in and out fast, turning on and off, and nothing worked.
My phone is up to date - iOS 5.1.1

Same happened with mine
Check your vibrate
Or bring it to apple and they will replace it with a new phone for free. As long as you are still in your warranty. Otherwise except to pay a couple hundred

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