2FA issues

Hi all, not sure if this is right subreddit, but let's give it a shot!

I use 2FA for Google- and banking accounts, using my phone number. So far so good. What if I lose my phone? I do have a backup phone (android, where my main phone is an iphone) - can I move all 2FA to authenticator, with another authenticator app (?) on android as backup? I have backup codes for Google applications somewhere.... but what about bank …

2fa accounts android app applications authenticator authenticator app backup banking google iphone main phone phone number privacy