Received 1 calls from this number. They never left a message on my phone. They are out of Phoenix, AZ but it is an unlisted number... but it is a land line (according to White Pages). Can't find out who they are unless you want to pay $1.99. (I've had 7-8 different phone calls from different numbers... all of whom don't leave messages. Well One left a message about some sweepstakes but the rest didn't).... On one of the other numbers I had received a phone call from... Someone else said that they had called them back and was able to remove themselves from the calling list. I called (302) 394-6679 and did that... I tried it with this number (657) 202-6367 and it was the same company... WCA Offer Clearing House!

Update:

(657) 202-6367 - Anaheim, CA
(302) 394-6679 - Wilmington, DE
(657) 202-6790 - Anaheim, CA

All three of these numbers are from the WCA Offering Clearing House. You can remove your phone number from their database. Take a few seconds but will keep you from receiving more phone calls from them.