Have 4S and am not heard when I make or recieve a phone calls

I have the Iphone 4S.  All of a sudden, whenever I make or receive a call, I can hear the person on the other end but they can not hear me.  Does anyone have any ideas of how to fix this problem.
Thanks

Try disconnecting the headphones and then adjusting the volume, does it say headphones?
There might be something in the headphone jack, maybe lint, dirt, or something else in there.
Take a look at this Apple document for more information -> iPhone: Can't hear through the receiver or speakers

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