Who called from 5706314560

I got a call from them saying they were going to reduce my monthly bill by about $20 or $30 (down to $69 a month, I think he said) if I was willing to commit to a year's service and he asked for the last 4 digits of my social security # and maybe my zip code (I had just woken up, so I was a little fuzzy).

They called and never left a message. I called the number back and answering machine came on claiming to be Frontier.

I don't think this is a legitimate Frontier Communications number.

ummm ya, it is.