A few companies simply don’t like my phone number; they’ve even told me that this is the problem in setting up an online account.
If it were happening all over the place, I’d switch VOIP providers; but in ten years, it’s only happened with a couple of companies. Even at that, I don’t like the trouble it puts us through. Many big companies have no problem with our phone number - some others, also ‘big’ - have a problem with it.
(There has been no POTS availability in my community for years.)
VoIP has fraud and identity verification issues. For account verification they usually want a mobile or something that is more connected with a geographic area.
https://bestreviews.net/sorry-voip-phone-number-is-not-allowed/