Iphone 4s problem, can't make calls?

I need help! When I call someone, or use voicemail. I can't hear anyone and no one can hear me. Everything else works fine on the phone. I tried everything, restarting, refreshing… What am I doing wrong!

Its stuck in headphone mode.
keep inserting headphones in and out until it pops out of that mode

Take it into the apple store, how old is your iPhone, this can happen when you drop your iphone too, even if it wasn't very hard, all iphone come with a 1 year hardware warranty so I would get it checked out otherwise you could be SOL

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