Telstra mobile customers are experiencing a mass outage in multiple states.
Customers have reported "no service" and cannot make calls.
Telstra said in a statement it was investigating the problem.
"We are aware of an issue currently affecting mobile voice and data nationally," the statement said.
"We are working to resolve the issue as quickly as possible and thank customers for their patience."
More to come.
OneHelp Reference Number: INC0015485
Services Affected: Telstra Mobile Network
For more information please contact the IT HelpDesk on 02 9850 HELP (4357) (opt 2), or email firstname.lastname@example.org