Helium has the chance to do something really funny right now /s

Sadly that's a high possibility, though I hope it won't come to that or at least there would be a network that allows this.

It'll be their own downfall. Telephony is handled perfectly fine through tcp/ip. So if carries don't support it, we'll start seeing components that turn the phone part of phones to Internet connectivity modules.

That will be harder than expected as the telco networks are an international standard with no way to verify anything about the local device except that it has the required cryptographic cert contained within the sim.

Well then no compliance. I'll take a dumb flip phone if it came to that. And with tethering I can use whatever I damn well please behind it.