You will need your backup code or access to your phone number to deactivate two-factor authentication and reactivate it on a new device. Keep your new backup code in a safe place that is only accessible to you.

Your account is still protected. The "Secure Element" of your device stores the cryptographic key for authorising 2FA-protected actions in the Scalable app. Access to the Secure Element requires authorisation via the device's biometrics or a passcode.