Why does one of the speakers go out?

I have a iPhone 4 and my left speaker went out the 2nd day I got it what's wrong with it?

It doesn't matter; it's under warranty take it back to where you bought it and get a new one.

The iPhone (all of them) only have 1 speaker. The other, though it looks like one, is a microphone. If that's the case then you should take it back to where you got it from (assuming it is under a warranty) & get it repaired/replaced

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