Caller ID says: BESTOPTIONS 931-202-9503. It's a voice activated recording about how I am about to turn 65 and Medicare. I have to answer to block, except, they are blocking me from blocking them!
Message caller appears on the phone as unknown, but is documented on the internet as "Stephania Reavely - Macduff Pl, Crossville, Tennessee" (http://931-202.reverselookupmobilephone.com/). I did not pick up the phone but suggestions from previous contributors in this page indicate Medicare SPAM or SCAM, making it possibly a telemarketer, or a third party unknown that has hijacked the number.