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

The telco believes a software defect is behind the outage

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.

Telstra customers are reporting problems connecting to the internet and making calls this morning. Follow live.

Mobile and internet services are affected as the telco says it is "looking into" the problem.

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

Follow our live coverage here.

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

A nationwide Telstra outage cut phone service, halted regional trains and froze card payments across Australia. Telstra blamed a network timing fault.

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

Australia's biggest telecoms company said on Wednesday it was urgently investigating the cause of a nationwide outage that cut mobile and internet services for thousands of…

Telco says issues all sorted, but transport networks expected to be disrupted well into Thursday

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

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