That's a tough one. You'll find that many 2FA systems for cell numbers don't work for voip numbers. Banks, for example, will check your voip number against a list of possible cellular numvers and when it's not on the list, they won't accept it.
The best setup I've found though for setting up voip on Graphene with notifications, calls, texts, etc comes from Michael Bazzell. inteltechniques.com
Awesome, thanks. Will check out Bazells recommendations to do this!
It's in his Mobile Privacy ebook
Thanks, yeah I found it last night, great recommendation!
TLDR for those that may be seeking a similar solution, he recommends either using mysudo or using an app called Sipnetic paired with a twilio voip account.
I’m going to test these out as I’m not sure how they’ll perform behind a vpn.
In terms of handling sms 2fa (when you have no choice, like some banks), he gave an example of a client of his putting a second SIM/esim on the phone that is $5/month for call/text and leaving it disabled whenever you aren’t expecting a 2fa code.
