Called us four times today. We did not answer. When our answering machine came on, no msg. was left. Unfortunately, even though the 'blockers', as listed by Tamianth in a Feb. 23, 2014 post, may help, these scammers can and do change their numbers continuously. So, blocking a number won't be effective for long. Best advice is to not answer your phone, unless you recognize the caller's number. If it is a legit call, a caller generally will leave a message.
This number has called me a few times and I didn't answer because I didn't recognize the number. Yesterday I called it back and it said I either won a Target or Walmart gift card for 100.00....I just hung up