My iphone won't vibrate even though vibrate is turned on?

I have an iPhone 3gs and it worked fine until I updated it (ios 6).
My phone, when on silent mode, won't vibrate when I get a message.
In settings, everything is turned on, the vibrate part is selected.
When the button (above the volume) is not on silent and then is flicked down to silent (vibrate) mode, it vibrates. However, it does not vibrate when I receive a message?

Any assistance would be greatly appreciated!

I had this same problem but forgot how I fixed it… Try plugin and unpluging some head phones in it Sorry lol

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