Text Scam, How Do They Know?

Clearly, ATT is not sending these rogue text messages. They aren't doing anything to alert their customers about the widespread problem either, that I'm aware of.  One approach would be to advise their customers that ATT messages will only provide information and refer customers to their ATT account home page online if any action is required, then instruct their customer base to NEVER click on any link provided in a text message.  This foolishness can end up compromising their phone and create a back door for scammers to cause all manner of chaos and crime.   

@linkblink This is taken from my monthly bill and there is info on the main page of this forum.

Help protect yourself from fraud
AT&T will never contact you by email, SMS, or recorded call asking for personal information. If you receive such an email, do not reply. Never use the links in questionable emails to determine if the email is valid. Fraudsters can create fake email headers, so the sender may not be real. They also can create realistic forgeries of websites. Do not fill out forms via email, because the data may not be secure. Instead, go directly to the company's website. Ensure a site is secure by checking whether there is an "s" after the http in the address and a lock icon at the bottom of the screen

Thank you for sharing this most useful information here.  Publishing a 'phishing updates' newsletter to inform registered customers of the latest scams could help as well.