Why can't my iPhone vibrate?

I have an iPhone 4 and some reason it stopped vibrating I use the little thing on the top left of my phone and I won't vibrate and I went to settings still it won't vibrate help me

The tumblers in your phone probably went out

Try turning the phone off and then on. If that does not work try doing a hard reset which you do by holding down both the sleep button and home button until it turns off and then turns back on with the Apple logo. If that does not work reset your settings by going to (Settings > General > Reset) if this does not work then something is probably wrong with your iphones tumblers, if it was purchased in the last year or you have some extended warranty you can take it down to apple or call the warranty provider if you went through a third party.

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