DANGER! Jamaican Scammer!   Do not answer these calls.  They will tell you you have won a lottery or sweepstakes.   They have been known to get enough personal information to be able to call the phone company to get your phone changed so they get exclusive access to you.  They will tell you not to communicate about your activities with your family members and friends.  They have posed as a local sheriff or police deparment.  

People have lost hundreds of thousands of dollars to these con artists.