


After you have changed your major passwords, you can reset passwords for less important services. Deal with financial and personal information first. This typically includes email, bank accounts, Facebook, and online storage. Start with your most important passwords.You can then add Google Authenticator to a new phone and re-link it to your accounts. You should also erase your phone remotely if possible. This will minimize the potential damage someone could do with access to your information, and if you do find your phone then using new passwords is only a minor inconvenience. If your lost phone has Google Authenticator on it, you need to secure your accounts connected to the app by logging in with an alternate method, and resetting the 2FA settings. It's better to take the time to reset your passwords and logins before physically hunting further for your phone.If you're worried that the phone is in someone else's hands, the sooner you do this the better, as identity theft is a serious and widespread issue.

You may also want to cancel any credit/debit cards that were registered to any online stores through that device (like the App store, for example). For some, this may be very little, while for others, it could be a huge task. The speed with which you need to do this and the extent of it will depend on how much you use your phone for online interaction.
