The primary cell phone number is required when enabling Two-Factor Authentication. We also strongly recommend setting up the primary cell phone number so that you can easily restore access to your account in the future.
To set up or manage the primary cell phone number, go to the Account Settings > My Profile section, open the “Account Settings” tab.
Click the “Add New Contact” button and fill in the following fields in the “Add New” pop-up window:
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Type: Select the “Cell Phone” option from the drop-down list.
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Cell Phone: Enter the phone number in the required format.
Click the “Add” button to complete the action.
To verify the phone number, click the “Verify” button in the “Action” column, enter the SMS verification code in the “Verify Code” field, then click the “Verify” button to finish. The phone number status in the “Status” column will change to “Active.”
To set the phone number as the primary one, click the “Set Primary” button in the “Action” column, then click the “Set Primary” button in the pop-up window.
