I've been idly looking at migrating my stuff away from voice, but it's problematic because some 2FA stuff is on the underlying phone number because various stuf

I've been idly looking at migrating my stuff away from voice, but it's problematic because some 2FA stuff is on the underlying phone number because various stuff refused to accept Google Voice numbers due to it being a SIP number... and not everything will allow you to just disable 2FA while you're doing the switch, some stuff wants to always be tied to a functional phone number. Thinking the solution may be that next time I upgrade my phone, I get a new SIM and run both phones at the same time for a month, transfer the google voice number to the new phone, and then do all the 2fa transfers to google voice (now AT&T) number. (if anyone has any tips to get google voice numbers to be recognized as a cell and not a SIP I'd be delighted... that's the major functional complaint I've got with GV.)