[valj]

I just changed phones and found this really simple. You can just store a phone number with Google and receive an SMS key if you forgot to print off a key before changing phones.

Everything seems to be working pretty well for me and I noticed improvements since last using the app 1+ years ago, but obviously can't guarantee it's still being updated.

[koolba]

That might work with Google itself but TOTP based 2FA codes aren't specific to Google. They can be used out of band by anyone and the SMS approach wouldn't apply to anybody else.

[valj]

Ahh yes - excellent point.