It worked for every single card-issuing bank in Europe.

SMS are fortunately both expensive enough there to make them uneconomical for banks to use them as an OTP factor, and have been found too insecure for payment authentication by themselves, requiring a second factor.

This has practically lead to banks offering something more secure and/or ergonomic, e.g. bank-specific authenticator apps (which often work without internet, and always work without cell signal, e.g. when traveling internationally), hardware authenticators, WebAuthN etc.

> Let’s get cellular carriers to make SIM swapping harder.

No, let's get financial companies to step up their game and offer something not liable to both security breaches and locking out users (when traveling, losing access to their number etc.)