Would like to know the origins of this caller

I received the following message:

"You just won a free $1000 Walmart Gift Card, enter "FREE" at http://www.walmart.com.myfreecard.biz/claim"

I personally despise these scams.

I rcvd that text as well. I called the number and it says it's not a working number. Go figure.

Same for me.

I got a message on my cell phone that I had won 1000 at best buy.