My iPhone 4 call volume is really low, what should be done?

I have a 2 month old iPhone 4, and all the sudden during a phone call (don't call to much, but starting to a little more) it went down Really low. It's on maximum, but it seems like it's on minimum. My friend suggested taking it to Apple, but my Dad won't be happy, for this is my first phone, and I've only had it for 2 months. Is there another way I can change it so I don't have to get a whole new phone?

Settings > Sound (or whatever it's called)

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