Who called from 4239999594

Received the following text message on 3/30/12:  Dear Walmar shopper, Congratulations you have just won a $1000 Gift Card. Click here to claim your gift www.click4Wmart.com   cancel:reply STOP

I saw several other posts with the exact same message but the phone number was different.  I'm sure it is a scam.

Got the same, just won a $1,000.00 gift card from WalMart. It's a scam. So how come they keep getting away with it?