I received same text from a different number, 208-219-6967 @ 9:38am central time:
"Your entry last month has WON! Go to http://bestbuyprizes.net/ and enter code 4656 to claim your FREE $1000 Best Buy Gift Card now!"
I got sprint im guessing sprint sold our numbers out.... prob best to call best buy first to confirm but i can bet its a scam since i never used my phone number for any drawings...