Left speaker on my iPhone 4S doesn't work?

I have a black iPhone 4S 16GB and the left speaker doesn't work. What's wrong with it? Is it even a speaker?

That isn't a speaker. It's a microphone. They look exactly alike and it's been like that since the first iPhone.

To the right of the sync port is a speaker, and to the left of the sync port is the microphone used during calls.

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