Who called from 2132810862

You've just been Pre-Selected to Win a 100$ Bust-Buy Gift Card, But only the 1st 1000 users that goto http://bestbuygifts.mobi and enter 7777 will Receive it!

What a crock!

"The brand you love is looking for testers for IPhone 5!  The first 1000 to enter 7777 at http://iphone5tester.mobi get to test & keep a new IPhone 5."

Who the hell are these people and how can I make it stop?