I got a text message at 3:55 AM from this number. Not very happy to be awakened at that time of night.

I got a text message about winning from Walmart. Scam.

They sent me a cell phone text message with the following content: "You've been Chosen to Win a $1000 Walmart Gift Card. But only the 1st 1,000 users that enter code 7777 at http://walmartprize.mobi will Receive it!." I have now blocked both the phone number and the URL (web site).

Got a text from +1 (310) 871-2591.
Apparently Walmart is giving me $1000 if I reply with 7777.
I'm sure this is not a scam.  
Got to go, someone is at the door to sell me a bridge!