2 step authentication

What if I no longer have access to any of my trusted devices?

If you can't access any of your trusted devices, you can still access your account using your password and Recovery Key. You should then verify a new trusted device as soon as possible.

Apple ID - Two Step Verifications FAQ

There should be another thing you can do to help you with if you have nothing to verify on

You should also make sure that you have a trusted number (e.g. landline, friends number) in case you lose access to your devices.

There should be another thing you can do to help you with if you have nothing to verify on