IPhone 4 microphone problems

So i got an iPhone and dropped it once and cracked the back on the iphone.
When i got it fixed the microphone doesn't work i fixed it and now it doesn't work again. It does work for a while for say 5 min and the other party on the phone says they hear "crackeling" noises. I can hear them perfectly fine. ANY ADVICE?

You should get it fixed by professionals. Send it to a company like this: http://www.phone-hub.co.uk/
With this company you can get individual things fixed like the microphone you are talking about.

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