Spam text message.  No opt-out offered.

Suspicious content:  "You've been Chosen to Win a $1,000 Walmart Gift Card!  But only the 1st 1,000 users that enter code 777 at walmartgift [dot] mobi will Receive it!"  

Speculation: Unusual use of capitalization suggests a non-English speaker may have written the message.  What text message spammer is trying to drive traffic to a .mobi web address?  I'm not going to be the one to find out.  I have to assume that the website they're promoting would try to install malware on my device.