This is not a spam message, this is a serious warning.
This is a word of warning to anyone who subscribes to AT&T. There is a company that has been contacting AT&T customers and demanding their social security number.
The company has been masquerading as AT&T's Discount Verification Department, to which AT&T themselves have claimed is a scam/phishing attempt.
If you have been contacted, or been asked to contact 877-290-5451 PLEASE contact the Federal Trade Commission immediately and DO NOT EVER give out your social security number to anyone!