[relik]

Does Google Authenticator provide protection against phone number porting? I read somewhere that Authy is susceptible to that, but GA is not.

[Klathmon]

It "provides protection" by not backing any data up anywhere, so if the phone it is on is wiped, the codes can't be recovered.

It's a blessing and a curse, but with a bit of work (like backing up all codes at creation time) it's a non-issue for me that I actually appreciate.

[martind81]

Google Authenticator, the one time password (OTP) app made by Google, is storing data locally on the device. To my knowledge it has no link with your phone number.