I just got one from this number that had "SAN ANTONIO TX" on Caller ID. I answered and got a recorded message about "card services", using a debit or credit card, qualifying to win a bunch of crap, yada yada. Asked at several points for a verbal response. Receiving none, the message said something like "Sorry to bother you", and hung up. Now it's blocked.

Called again  - no message

I answered and was told I had won a free trip to the Bahamas.  Hung up.

12/23/15 @ 12:45PM - Received a call on my cell phone from 210-892-1790 (San Antonio, TX). No message was left.

No mesage left.