Who called from 3863614000

I received a call from this number at 11:52 am on 12/27/2013, of course I didn't answer and they left no message.
My cell phone carrier is through SPRINT.

just tried to call back the number and was told this number is no longer in service. Thing is they JUST called not ten minutes ago.

I have Verizon and call was to my iPhone. Obviously this is not just a T-Mobile thing. Good thing I never answer ANY call from a number I don't recognize. I DO keep a list of these morons in Microsoft Word to refer to if necessary. So far the list contains 106 numbers, mostly scams and solicitors. If only there was a product that could block an unlimited number of callers.

No one there when I answered.  Tried calling back but got a busy signal.  Just blocked the number on my cell phone.

How do they make a "living" putting a sign in your yard and giving away free security systems?  So they can break into your house?!