Google Authentication

Despite the fact that the Google Authenticator now allows you to transfer codes using a QR code, it's always a good idea to make a backup of the codes you get by setting it up on each portal. Personally, I keep a second unused phone with GA as a backup and codes in my notebook. I advise you do it too

Google now allows you to transfer your credentials to another phone. Go to two-step verification page and click Go to other phone link and scan QR code or enter credentials to new phone. Your old authentication application will stop working.

Other services that use Google Authenticator may not offer this feature, so you may need to disable and reactivate your account or extract the codes. One of the following processes will allow you to enable Google Authenticator on many devices - such as a phone and tablet - although Google says it does not.

If you restore factory settings and do not want to rely on printed security codes or SMS verification, you can disable two-step authentication in advance. To do this, click the Delete link on the two-step verification page. Temporarily disables two-step authentication.

Perform a reset to the factory settings, then add the authentication application from this page again. Once you have reached the stage where you will receive a QR code and a code that you can enter manually, re-enter it into your phone. If you want to enable Google Authenticator on multiple devices, enter this code on multiple devices before you close this window.

You can save the code written here and keep it in a safe place, which is not necessarily a good idea - anyone who finds it will be able to enter it into their phone and display the authentication codes based on time.