Iphone 3GS problems when people ring they can't here me?

When people ring me or I ring them they say they can't hear me it's not all the time but 90% of the time they can't hear me… Is there anything I can do?

Maybe they just don't like you.

Happened with my girlfriends iPhone 4 when she dropped it, the mic connection had come lose, she took it to a phone shop and they fixed it for her, cost about £10.

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