Here’s a memo on how to set up the Google Authenticator app, which manages Google 2-step verification, on multiple devices.

It’s written in Google’s official manual.

・Installing Google Authenticator - Google Account Help

The site below is more understandable than the official site.

・Migrating 2-step verification when changing iPhone models | Steppin’ out

Finally, here are URLs for services other than Gmail where I have 2-step verification set up.

Dropbox

・Account - Dropbox

Evernote

・Security Overview

GitHub

・Security

That’s all from the Gemba.