[lapsis_beeftech]

It is more like phone based 1FA at this point. My Google account cannot be recovered at all even though I know the password and still control the recovery e-mail because at one point I made the mistake of adding a (now inaccessible) phone number.

[lifestyleguru]

Hell, I have diligently backed up recovery codes and security question answers to dozens of services... including Google and banks... and many of these providers require my phone number or their already activated mobile app to log in.

[toomuchtodo]

Have you tried calling the number to see if whomever has it will send you the code it receives?

[al_borland]

If someone called me with a request like this I would assume it was a phishing attempt to take over my own accounts.