Only one audio canal works

Hello folks, I've had my iPhone 3G for over a year now, but now the first problem has occured. When have my headphones plugged in, there is only sound on the left of them. The same thing happens when I want to listen to music through the speakers. Only one of them work. How can I get back to stereo sound?

The iPhone includes a single external speaker. The opposite grill that appears the same is the microphone.
Do you have access to another set of earbuds to try to determine if the problem is with your earbuds or with the iPhone?

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    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-
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