Telstra remains under fire after callers were again unable to contact Triple Zero once again.

The widespread outage is affecting mobile calls and data connections, and has even prevented some businesses from processing payments.

The widespread outage is affecting mobile calls and data connections, and has even prevented some businesses from processing payments.

Tech expert Trevor Long discusses Telstra's major network outage affecting customers this morning.

Trains in Victoria and NSW were brought to a standstill as thousands reported issues with their Telstra network on Wednesday morning.

Eftpos terminals have been affected too, with some small businesses switching between payment machines and offering PayID transfers.

Telstra said about 90 per cent of calls were restored by 10am Wednesday. But phones weren’t the only technology impacted.

Carrier restoring mobile services after network used by millions goes down for many users, shutting down regional trains and affecting emergency calls

These outages have exhausted public patience, and promised fixes aren’t being felt yet.

Telstra is working rapidly to bring its mobile network back online, after hundreds of thousands of customers were caught up in a nationwide outage.

Telstra is investigating what caused a national outage that stopped trains, transactions and some Triple Zero calls.

Telstra’s nationwide outage caused chaos in Victoria on Wednesday, with dozens of Triple Zero calls dropped and thousands of commuters stranded.

The Telstra outage has seen the iconic Ghan ground to a halt.

The telco says a “secondary issue” is stopping some Triple Zero calls from connecting, hours after it declared the day’s outage resolved.

Police in several states are checking on people who could not reach Triple Zero, after a second fault overnight again stopped some emergency calls.

Police in several states are checking on people who could not reach Triple Zero, after a second fault overnight again stopped some emergency calls.

Rail disruption in NSW and Victoria caused by the Telstra outage rolls into day two.

Some Triple Zero calls are still experiencing issues, Telstra says, as it races to fix a second network issue.

More than 20 of the 300 Triple Zero calls that failed during the nationwide outage were from Queensland, with Telstra confirming a second issue had threatened emergency calls…

Seventeen of the 300 Triple Zero calls that failed during the nationwide outage were from Queensland, as a second issue threatens to derail the telco again.

Telstra says work is ongoing to resolve a "secondary issue" impacting customers trying to make calls on its network, including to Triple Zero, but some people may still be unable…