Are there any good VOIP alternatives to Google Voice that don't get tripped up as invalid phone numbers by other companies' snake oil authentication? From what I've found, GVoice is uniquely large and has enough "normie" Google Fi customers that companies can't discriminate the way they do against say Voip.ms and Flowroute [0].
My tentative plan is to get (another) cheap paygo SIM, stick it in a cell modem attached to a server, and set it up to forward all texts to email/xmpp/etc. Use that for all these longstanding snake oil auths.
Then move my main personal number (used to be a mobile number, now at GVoice) to a VOIP service. At which point if someone can't call/text my personal number because they're using some crappy service (eg Comcast mobile), then too bad, they can figure it out.
[0] I figure Twilio is in this same boat, although I don't have much experience with them?