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.