https://www.lifewire.com/why-phone-based-authentication-can-be-insecure-5087935

Why Phone-Based Authentication Can Be Insecure
Cyber criminal’s delight?
by Sascha Brodsky
Published November 17, 2020

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Key Takeaways

Hackers can steal phone-based multi-factor authentication (MFA) codes, experts say.
Phone companies have been tricked into transferring phone numbers to allow criminals to get the codes.
A simple, low-cost way to increase security is to use the authenticator app on your phone.

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I don’t understand why corporate CSOs don’t insist on authenticator apps versus some lame alternative.

And, if you don’t want to “mandate” it to Customers, then their services should support it.

Argh!

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