People are being kind of smug about the FBI announcent not to text anymore, and I understand why... But there's a bigger problem than your texts to aunt Edna being intercepted.
Your mfa codes that are texted to you are now fully compromised. And a lot of websites only have sms mfa. That's the real story here. We've known for a while sms mfa was insecure because it's susceptible to SIM cloning and hijacking but there's now confirmation of man-in-the-middle happening. That's 10x worse.