I also recieved the text message like Dana, but the number my text message told me to call was 866-593-9330.

Received the same message as Bob above, called the number and was told that I could get my voucher for a processing fee of $4.35.  Told them where to go to find the $4.35.

Received a text, same format as noted above. I haven't given my number to any website.

"thanks 4 visiting our website call 800-571-4439  to claim your $200 walmart rebate voucher! reply stop 2unsub"    spam txt msg.  i have no idea how i got on any list

Also got a text from this # on my cell phone that I barely use, and certainly never entered it on a website.  Message to call 800-571-4439 for a $200 Walmart rebate voucher.  I called (used *69 to block my number) and got no answer.  Definitely will not reply to text.  As Al above writes, they start by requesting a $4.35 processing fee.  It's got to be a scam and possibly an issue for FTC (Federal Trade Commission) to look into since this is a San Francisco area code doing business across state lines. They're probably harvesting credit card info to use and/or sell.