I also prefer to use Google Authenticator, I may already accustomed to this technology. In addition, there have already been cases when you had to Transfer Google Authenticator due to the loss of an old device. By the way, Transfer Google Authenticator to New iPhone is a process in which preparation is the most important part. By the way, it is useful to read How to protect yourself in case the iPhone crashes https://www.protectimus.com/blog/how-to-transfer-google-authenticator-to-new-iphone/ if you use this technology. In short, you need to backup the google authenticator key. It is quite simple and does not need to resort to anyone's help)