Telstra was urgently investigating a second network fault on Wednesday night that was stopping some calls from connecting, including to Triple Zero, hours after the telco said it had resolved the outage that crippled its mobile services for much of the day.
In a statement issued about 9.30pm AEST on Wednesday, Telstra said that while it had fixed the fault behind the daytime outage, it had identified a βsecondary issueβ affecting some calls, including to Triple Zero.
Eamon Gallagher
People calling Triple Zero might hear an error message while their phone tried to connect to another mobile network, the company said. It urged anyone who could not get through to wait up to 90 seconds for their phone to switch networks. If that were to fail, Telstra urged customers to try to call from a different phone.
Telstra said it would carry out a welfare check whenever it detected a failed Triple Zero call. βWeβre working urgently to resolve this issue,β the statement said.
The fresh fault capped a chaotic day for the countryβs biggest telco. A nationwide outage that began early on Wednesday morning caused more than 300 Triple Zero calls to fail, according to Telstra, with six people telling the company they needed help after the company and police carried out about 300 welfare checks.
Two internal Telstra sources attributed the daytime outage to a software issue that sent the networkβs timekeeping systems back almost 20 years, to 2006. Modern mobile networks rely on precise timing to authenticate devices, and the incorrect date caused parts of the network to reject customersβ phones.
Telstraβs chief financial officer, Michael Ackland, confirmed a software fault had changed the time across the network and said the company was working through the details. He apologised for letting customers down βin their hour of needβ and said the daytime issues had been resolved by 4pm.
Ackland said more Triple Zero calls had failed than the company first expected, after some phones did not switch to Optus or TPG for emergency calls.
Liberal senator Kerrynne Liddle said her office had received a report of a death following an apparent failure to reach Triple Zero during the outage. South Australia Police said they were not aware of any death in the state as a result of the outage.
βThe Senatorβs office received a report this morning about the distress caused in relation to the outage,β a spokesperson said when asked for further details. βThe family have been advised to contact SAPOL when theyβre ready to talk about their experience.β
The earlier outage brought down Victoriaβs entire regional passenger rail network, delayed some NSW trains, and hit payment terminals, electric-vehicle chargers and smaller carriers that use Telstraβs network, including Boost, Belong and Aldi Mobile.
Communications Minister Anika Wells, who cut short her leave to deal with the crisis, said there was βa reason that telcos are the least trusted industry in Australia β it is days like todayβ. Telstraβs chief executive, Vicki Brady, brought forward her return from leave overseas to Friday.
Telstra was fined more than $3 million in 2024 over an earlier outage that stopped some customers reaching Triple Zero. The telco is now facing potential penalties in the tens of millions of dollars for Wednesdayβs issues.
Australiaβs telcos have been under sustained scrutiny over reliability since two Optus failures. A nationwide Optus outage in November 2023 knocked out more than 10 million services and left about 2000 people unable to reach Triple Zero, and a separate Optus outage in September last year, in which hundreds could not reach the emergency line, was linked to two deaths and led to powers for a Triple Zero Custodian and tougher rules now being tested by Wednesdayβs failures.
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David Swan is the technology editor for The Age and The Sydney Morning Herald. He was previously technology editor for The Australian newspaper.Connect via X or email.