Optus has been hit by a nationwide outage, with its mobile phone and internet services down for millions of Australian customers and businesses.
On its website early on Wednesday, Optus said its engineers were investigating a network fault affecting customers.
Mobile phone users were unable to make or receive calls and mobile internet services were down.
According to the website DownDetector, users started reporting issues around 4am on Wednesday.
A spokesperson for Optus said the company was aware of the issue affecting mobile and internet customers and was working to identify the cause.
“In case of an emergency, customers can still call 000,” the spokesperson said.
Train services were also interrupted in Melbourne due to the Optus outage, with ongoing delays of up to 45 minutes, and cancellations expected.
Northern Health in Melbourne said all phone lines into its hospitals were affected by the outage.
“This includes phone lines into Northern Hospital Epping, Broadmeadows Hospital, Bundoora Centre, Craigieburn Centre, Kilmore District Hospital, and Victorian Virtual Emergency Department (VVED),” it said in a statement.
Sydney’s Westmead Private Hospital is also affected by the Optus outage, with phone lines down.
The outage has also affected companies that resell Optus services, according to DownDetector, with users reporting issues for Amaysim, Dodo and CatchConnect mobile services.