Triple-zero calls were out of action for eight hours longer than Optus initially claimed after a "bewildering" response to a botched network upgrade during which three people died, authorities have revealed.

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Optus has admitted to the SA government calls were out of action for 10 hours on Thursday and SA police worked through Friday night conducting welfare checks on 150 people whose triple-zero calls failed, SA Premier Peter Malinauskas said on Saturday.

SA police said an eight-week-old boy from Gawler, on Adelaide's northern fringe, and a 68-year-old woman from the Adelaide suburb of Queenstown died during the outage.

The third death linke

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