I would start with cellular carriers and nations that intentionally take steps to block anything VoIP as a threat to their revenue model. Or because anything vpn/ipsec/whatever related is a threat to local Internet censorship laws.
Plenty of places the sort of ipsec tunnel used for vowifi is not usable on whatever consumer-grade cellular or local broadband ISP you might find. On Sun, Apr 18, 2021 at 11:11 PM Mark Tinka <mark@tinka.africa> wrote: > > > On 4/19/21 06:50, Julien Goodwin wrote: > > > This is already probably past the point of being on topic here, but you > > tickled my personal favorite one of these. > > > > My airline of choice (Qantas) has mandatory SMS second factor, after > > perhaps a mobile carrier requiring it for support one of the most > > facepalm-worthy uses of SMS 2FA I've seen. > > It's interesting that VoWiFi is meant to support both voice and SMS, > domestically and when one travels. So I'm curious why SMS's would not > work with VoWiFi when traveling to a country that won't deliver your > SMS's generically. After all, VoWiFi is, as far as I understand it, > meant to be a direct IP tunnel back to your home network for both > billing and service. > > If anyone has more clue about this on the list, I'd really like to know, > as my mobile service providers hardly know what I'm talking about when I > ring them up with questions. > > Mark. > >