My iPhone 4 turned off and won't stop vibrating

This is happening now. My reaction, WTF! It just turned off when I was on instagram and then just started vibrating! And it won't stop! Someone help me. I tried resetting and plugging it in but nothing!

Just wait until your phone dies.

Hold the home and the lock button for about ten seconds until everything shuts off. Turn it back on and that most likely will fix it.

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