I just got a text to my cell phone with the same message. I think it is bogus. I never entered a best buy contest.

I received the message "Your entry last month (?) has Won!! Goto Http://reward-bestbuy.com and enter your Winning Code:xxxx to claim your Free $1000 BestBuy Gift Card." I believe this number is being used to lure people to that url that seems invalid. Brief research on whois.com shows the domain registered in China, three days ago, to an almost random email (36925wq@sina.com) and seemingly incomplete address info. For comparison bestbuy.com is registered by MARKMONITOR INC. in Minnesota with complete information that makes sense. There is no mention of "reward-bestbuy" on bestbuy.com.