My iPhone 4 is randomly vibrating?

I've heard that your phone will vibrate or make noise if it's about to die, but mine will do it about every hour and nothing happened. No phone calls, no texts, no notifications. Is it supposed to do this? Should I take it to the apple store?

It could be the the vibrate mechanism in the silent switch is broken. Best thing to do is send it off to Apple.

Use it for pleasure

On the side by the volume buttons is the silent button and if thats tbroken then it will vibrate randomly you can send it to apple to fix it or disble the vibrate settings in settings

Http://gdgt.com/question/phone-vibrates-randomly-with-ios-5-gvg/

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