How can i adjust speakers volumn in iPhone 4?

Hi,
My iPhone 4's (New iPhone) speaker one is working (Left side) another one is not working (Right side) so how can i adjust speaker's volume or is there any setting need to be configure? While touch finder in front of speaker i can released effect on Left side speaker but i can't released sound effect on right side so please suggest me any setting need to be configure?
Thanks in advance,
Suresh Balakrishnan

From apple iPhone specifications. Bottom on the left and top on the right.
The tiny hole on the top to the right of the headphone minijack is a second mic. Apple says "The main mic, located on the bottom next to the dock connector, is for phone calls, voice commands, and memos. The second mic, built into the top near the headphone jack, is for FaceTime calls and for making your phone calls better. It works with the main mic to suppress unwanted and distracting background sounds, such as music and loud conversations. This dual-mic noise suppression helps make every conversation a quiet one."

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