People. STOP using your phone number for 2FA. #cososec
You can also add a secure passphrase to your account that must be given in order to make account changes. That would shut down this scam.
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From NPR News
'SIM-Swap' Scams Expose Risks Of Using Phones For Secondary I.D. https://n.pr/2Wd1gma
"People who are using phones as their only source of two-factor identification are inviting identity theft," Bennett warns.