Why won't the speakers work for my iPhone?

I have an iPhone 4 and after the 6.0.1 update, the speakers stopped working; I checked everything, nothing was out of place. However, when I plug in my headphones, the speakers work perfectly. What's wrong with it and is anyone else experiencing this?

I think the software was not installed properly. I recommend taking your phone to the Apple service station.

URGH! After updating my speakers stopped too!

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