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I have experienced that some banks (and the Venmo person-to-person payment app ) does not accept a Google Voice number for 2-factor authentication or other forms of phone-based-verification (PBV).

By the way, 2-factor authentication and PBV is another plague that is sweeping the land. Avoid 2-factor authentication if at all possible!. Even some cellphone services that are based on Voice-Over-IP are deemed not acceptable -- either by mistake or by design.

In any case, https://numverify.com/ will tell you whether you phone numbers appear to be "landline", in which case they often will be disqualified as acceptable for authentication purposes.

This is an important topic. Soon it will be so bad that you MUST have cellphone subscription with a major carrier in order to prove who you are. There really should be a law that any web-based service or business should not be able to demand that you have a certain kind of cellphone service to use their system.

Please, everyone, share your knowledge on this topic, I think it is very important and may become critical.

NOTE: This was a comment in another thread, but I think it deserves its own thread. If anyone has a nice graphic for it, pls. send a link.

Reference: https://patrick.net/post/1315717/?c=1504127