iPhone keeps buzzing randomly... WHY?!?!?

Bella

Member
my phone keeps buzzing randomly- its the same buzz/vibrate as you would receive on facebook mobile when someone talks to you--- but its not facebook. Its also not the email coming thru as that is a different sound etc.

Whenever I hear my phone buzz-vibrate I look at it and there is nothing there...

What is this buzzing? Is my phone malfunctioning?! It seems fine but this is starting to annoy me :/
 
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