Iphone 4 bottom mic not working

I dropped my iphone 4 and now when I make calls/receive calls, the person on the other line can't hear me at all. The only time someone can hear me is through face time. I really don't know how to fix it, someone help me!

Added (1). I've also tried using my apple headphones but it still doesn't work

Take it to the place you got it I got mine from AT&T and they let me get a brand new one for only 1$

This is a physical issue, not software. You would need to replace the mic on the phone. The part itself is not that expensive on eBay, if you can fix it yourself. Or else you will have to go to one of those cellphone repair places. Or, if it is still under warranty, they may fix it for free.

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