This does not apply to most people but in the US at least, you can set your phone number to a Google Voice number. You don't have to forward text messages from

This does not apply to most people but in the US at least, you can set your phone number to a Google Voice number. You don't have to forward text messages from Google Voice to a carrier so you can ensure your Apple ID two step (isn't it two step rather than two factor?) authentication is just as secure as your Google account.