Optus was told twice by customers about an outage to Triple-0 on Thursday morning, it has been revealed.

It comes as a fourth death has been linked to failed attempts to contact the emergency services which were down for nearly 14 hours in parts of the country, with an eight-week-old baby among those who died during the outage.

CEO Stephen Rue said the planned technical upgrade started at 12.30am on Thursday and was stopped at around 1.50pm after South Australia Police had notified Optus of a problem.

But Mr Rue also said two calls had been made to the Optus contact centre on Thursday morning to inform the company that Triple-0 was not working — these are now the subject of complaints referred to Optus by the Telecommunications Industry Ombudsman.

He said: “Early review suggests that w

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