No, every SMS 2FA should be prohibited by regulatory certifications. The telcos had years to secure SMS. They did nothing. The plethora of well-secured commercial 2FA authentication tokens, many of them free, should be a mandatory replacement for 2FA in every security governance regime, such as PCI, financial account access, government web portals, etc. 

-mel via cell

On Apr 17, 2021, at 6:27 PM, Tim Jackson <jackson.tim@gmail.com> wrote:


Every SMS 2FA should check the current carrier against the carrier when enrolled and unenroll SMS for 2FA when a number is ported out. BofA and a few others do this.

--
Tim

On Sat, Apr 17, 2021, 8:02 PM Eric Kuhnke <eric.kuhnke@gmail.com> wrote:



Anecdotal: With the prior consent of the DID holders, I have successfully ported peoples' numbers using nothing more than a JPG scan of a signature that looks like an illegible 150 dpi black and white blob, pasted in an image editor on top of a generic looking 'phone bill'.