Telstra blames ‘software defect’ for major outage that hit mobiles, trains and triple-zero calls

Telco said outage was not due to a cyber-attack but warned of scammers calling people claiming to be from Telstra

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Telstra has blamed a software defect" that changed the time servers for a major outage in which thousands of mobile customers were unable to make calls or access data on the country's largest network on Wednesday morning.

The telco, which powers about 25m mobile services nationwide, confirmed the outage on Wednesday, with all services restored by 4pm AEST.