You can login using an authentication code received using a pre-registered backup phone number in cases in which you have lost your mobile device, or cannot receive authentication code through your authentication application or SMS.
* This feature is not available with the free plan.
Setting up a backup phone number
- From the menu under the [Username] in the top right of the chat screen, select Account Settings.
- Click the [Change] button for two-factor authentication.
- Click [Settings] for the backup phone number.
- Enter your country code and phone number, and click [Send SMS].
- Enter the six digit authentication code you received by SMS and click [Phone number validation].