IPhone 4S earpiece speaker extremely quiet?

Since updating to iOS 6 the in call volume of the earpiece has been so low I can't even hear the person on the other line. Has anyone else had this problem or know what the fix could be? The hasn't been any water damage and I don't use a screen protector. Any help is great help, thanks

Just curious, have you tried turning up the volume when you are making your calls? That might be the problem

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