Optus has begun contacting millions of customers affected by a massive data breach, more than 24 hours after alerting the media of the cyber attack.
Victims of the hack were emailed on Friday afternoon and told their names, birth dates, phone numbers, email addresses, driver's licence numbers, passport numbers and addresses had potentially all been accessed.
Optus also explained to customers why they may have learned of the breach via the news before hearing from the company.
