rec'd this text in yellow background like an official message claiming I won $1000 from best buy. I didn't sign up for a sweetstake or anything with BB. I will go no further with it then this website.

Security company Cloudmark created a spam messaging reporting service that nation’s major wireless carriers agreed earlier this year to start using. Now, customers of AT&T Mobility, Verizon Wireless, T-Mobile, Sprint and others can forward their text spam message to 7726. The mobile phone carrier will ask customers for the phone number that’s linked to the spam message so they and Cloudmark can start investigating.

http://www.ajc.com/news/business/text-spam-messages-on-the-rise/nSW3C/

Have not shopped at best buy Must be a scam

It's a scam.  See alfalfa's post above yours.