If you change your mobile phone, you can transfer 2FA to a new device by following these steps
- Open the Google Authenticator application on your old device
- Tap 'Option' (3-dot sign) on the top right of the screen
- Choose 'Export accounts' and tap 'Continue'
- Choose the account that you want to export and tap 'Export
- You will get a QR Code on your old device
- Open google authenticator on your new device and choose 'Scan a QR code' to scan the QR code that you prepared from your old device
- The system will import your 2FA account from the old device into your new device