my point was that the type of number is detected at the time it is setup, not when it is used. Hence a mobile number I is validated by the institution BEFOE it is ported.
I've not seen an institution yet that is setup with 2fa on a mobile phone number; where that number is then ported to Google voice that did not continue to work. Do you have an example of one that failed after porting?
If you establish your 2fa while you have a valid mobile number, you can "port" your number to Google voice and it should continue to work. Most institutions validate the number when it is first setup, not each time it is used.
yes I have. It was accepted but Asiana. If you do it day before your flight, the reservation is good for 48hrs. You can (if you want) purchase the flight
It is the airline that may be fussy. They require an onward ticket within the 60 days of your arrival since there's no guarantee you will get an extension.