You may be getting these texts too. I have received several over the past couple of weeks. It looks like AT&T is trying to get ahold of me. They want to give me something free. I am very skeptical about everything I receive via text messaging or emails.
I'm been a happy Happy State Bank account holder for years. They are always communicating with me. And they do it one way every time. They recently sent me an email to check my messages in my online account. When I did they let me know about a phishing scam making the rounds locally.