Why does my samsung caliber vibrate randomly?

holly

New member
I just got my new phone(samsung caliber from US Cellular) a week ago and I notice that it vibrates randomly, but doesn't light up. It will be sitting on the table and just do a short little vibrate, but nothing is on the screen. Anybody have any idea why it does this?

Thank you in advance for answering! :)
It does this when there has been no missed call, text message or voicemail.
 
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